Former high school foes turned rookie cop partners can't catch a break, until they're assigned to pose as students and bust a drug ring inside their old alma mater. Living like teenagers again, they slip back into their adolescent selves and risk the case - and their friendship - with hysterically disastrous results!
Continuity When Jenko is hanging with the nerds listening to Schmidt at the party, his collar on the left side is open in long shots and folded in on closeups.
Miscellaneous Towards the end of the movie when Jenko attempts to shoot Mr. Walters, Jenko pulls the trigger on his Glock pistol twice. If a Glock is empty of ammo, you can only pull the trigger once and it will stay in a locked position.
Miscellaneous During the motorcycle chase scene, one of the gang members shoots a gun with his right hand while appearing to accelerate. This is impossible on this motorcycle, as the throttle control is on the right handlebar.
Miscellaneous The rear view mirror has been removed from the Hyundai, the Ford Mustang, the Porsche, and the red Mercedes.
Factual Mistake Eric is introduced as having received early admission to the University of California's Berkeley campus. In real life, none of the University of California campuses allow early admission.
Factual Mistake Much of the Korean writing seen in the church is grammatically incorrect (and the same Korean translation found on online translators). For instance, the Korean version of "Aroma of Christ Church" is written in a manner where Christ Church is possessive of the word aroma, e.g., "Christ Church's Aroma" or "The Aroma that Belongs to Christ Church").
Factual Mistake In 2010, the Supreme Court ruled that if a cop neglects to read your Miranda rights, that is not necessarily grounds for release from charges. So the cops' mistake at the beginning is not accurate.
Crew/Equipment Visible (at around 1h 13 mins) During the motorcycle chase you clearly see that the traffic has been stopped on the highway to shoot the scene. This takes place when Schmidt and Jenko are seen on close up and through the rear window you can see a car across the street.
Continuity When Jenko throws the bottle to explode in the black limo he is seen throwing it bottom flying forward. When the bottle is shown in the air it is shown cap flying forwards.
Continuity When Jenko is writing on the board in AP Chemistry after he is taken the drugs, the sound and image reveals he is writing with a piece of chalk. When camera changes angles it is shown that he was in fact writing on a white board with marker.
Continuity Mr. Walters says he needs Doug/Schmidt to run the last leg of the 4x400. But at the track meet, Schmidt's leg of the race is only 100 meters.
Continuity When Schmidt is chasing the drug dealer in his bike he has is gun drawn, but in the next scene is gun is sheathed.
Continuity When first arriving at the school and analyzing different groups of kids, an Asian girl with spiked hair can be scene wearing a Panda dress. Shortly after as Schmidt and Jenko talk with Eric by the cars, a different Asian girl is now wearing the Panda dress.
Continuity One of the undercover women is seen in the background while Captain Dickson talking to Jenko and Schmidt. She is there for a second, but is gone when it switches to them again.
Continuity When Schmidt and Jenko walk through the church doors at the 21 Jump Street Church there is old news print covering the doors. During the next shot when they're walking through the doors the newsprint is missing.
Continuity The front right of the Drivers Ed car alternates between damaged and undamaged when it's stopped at the red light behind the bikers.
Continuity When Schmidt tells Jenko it might have been a bad idea to put a wiretap on Eric's phone, a substantial number of cops can be seen behind Schmidt. The camera cuts to Jenko and then back to Schmidt where a lot fewer cops are seen behind him. The camera cuts back to Jenko and back to Schmidt one more time, but this time there are no cops anywhere. The number of cops behind Jenko doesn't seem to change, however.
Continuity Immediately after the fight at the party is over, Schmidt's back is visible with no stab wound. A few shots later, it's revealed he's been stabbed.
Continuity (at around 1 min) When Schmidt and Jenko first open the door for their party there are 3 guys at the door (Zack, Roman and Delroy). When they show them walking in Delroy is not shown walking through the door.
Continuity When the three nerds show up for the party. Only two nerds go threw the door and then the door closes. What happened to the third nerd?
Continuity When Schmidt (Jonah Hill) is praying to Korean Jesus the figure has a dove in his right palm which is held out. In another scene later in the movie you see Korean Jesus again but minus the dove in hand.
Continuity After the gun fight at the hotel, Jenko pukes on Schmidt's white jacket, but later in the next scene, the puke on the jacket is gone.
Continuity When Schmidt is running in the relay race, he throws his baton across the finish line. Immediately afterwards, he has the baton again and is making inappropriate gestures with it.
Audio/Video Mismatch When Eric is telling Jenko that he doesn't trust him because he looks 40. He says, "After a stunt like that, there is no way you can be cops," and although his mouth is covered you can see that it is not moving at all.
Character Error During the Limo chase sequence at the end, Jenko mentions covalent bonds in context of lithium batteries and potassium nitrate. A bond involving metals would be Ionic and not covalent.
Hanson (Johnny Depp) is seen in disguise as a biker eating a jar of peanut butter, based on a suggestion by Depp during his last season on the show. Penhall (Peter DeLuise), was also seen in disguise as a biker based on one of the character's attires in the original series. The disguised characters were written specifically for Depp and DeLuise by Jonah Hill.
Footage of Dustin Nguyen from the original show are shown on television screens during the shootout at the prom. Whenever Nguyen is shown, a TV screen gets shot.
Holly Robinson Peete reprises her role as Judy Hoffs in the scene where they choose the car from the motor pool.
Every single scene that Johnny Depp's character Tom Hanson appears in, he is eating. This is a reference to the show where his character would be eating, sometimes several times during each episode, often in scenes of great importance to the plot.
The drug Schmidt and Jenko go undercover to look for is abbreviated H.F.S., which stands for Holy F*cking Sh*t. This is (not coincidentally) the first phrase the teenager in the youtube video says when he takes the drug.
At the end of the film it is revealed that one of the bad guys is actually Tom Hanson, played by Johnny Depp, from the original 21 Jump Street (1987) series. He has been undercover for years with the villains using the alias D.B. Following 21 Jump Street Johnny Depp played another cop who was long term undercover with criminals whose name was Donnie Brasco (1997) ... D.B.
Originally, the drama teacher talks about doing cocaine with Whitney Houston's niece, but the line was changed after the death of Whitney Houston. The line had to be dubbed as "doing cocaine with Willie Nelson's horse".
While Jenko and Schmidt are being briefed on HFS there is a video sharing site on the computer. Two of the related videos in the sidebar were uploaded by users Chanchan and Brielar. These are references to Channing Tatum and Brie Larson.
The song Straight Outta Compton by N.W.A. is played in one scene. Ice Cube, who plays Captain Dickson, was a member of N.W.A.
When Schmidt and Jenko go undercover as brothers, their last name is McQuaid. In the original TV show, Johnny Depp's and Peter DeLuise's characters would also go undercover as the McQuaid brothers in several episodes.
Wilhelm Scream: Just before the One Percenter leader crashes his motorcycle into the chicken truck during the car chase.
Wilhelm Scream: During the credits, when a character dives through a window.
In one scene the bad guys are actually watching the TV series 21 Jump Street (1987) on TV. While other original cast members show up in cameos in the film, Dustin Nguyen (Officer Harry Truman Ioki) does not. But he is worked into the film here as almost all the shots on the TV are of Ioki.
The understudy for Peter Pan is named French Samuels. Samuel French is the name of the publishing company that manages the rights to the musical "Peter Pan".
Throughout the film as the two main characters return to "The Chapel" they are confronted by 2 female officers who are ragging on them and touting their own exploits. Busting a prostitution ring, and busting up a chop shop run out of a High School auto shop. Both of these cases are clearly based on episodes (from season 1) of the old series in which they did infiltrate a modeling ring that was used for prostitution and a chop shop run out of the auto shop.
Jennifer Lawrence, Juno Temple, Julianne Hough and Gemma Ward auditioned for a role.
Emma Stone was considered for the lead female role but had to drop out due to scheduling conflicts with The Amazing Spider-Man (2012).
Channing Tatum's character is named Jenko after Captain Richard Jenko, played by actor Frederic Forrest, on the original 21 Jump Street (1987) TV series. Jenko was the original captain of the squad before being killed off and then replaced by Captain Adam Fuller, played by Steven Williams.
At one point, Dave Franco's character says that he doesn't trust Channing Tatum's character because he looks like he's 40 years old. In reality, Tatum is only five years older than Franco.
While undercover, Jonah Hill's character's cover is almost blown by someone he knows personally, and he avoids this by pushing her away and saying that she tried to grab his private parts. This same exact thing happened to Johnny Depp's character in Donnie Brasco (1997) while he was undercover.
The two guys dressed as ushers standing on either side of Channing Tatum and Jonah Hill as they exit the limo and enter the prom are actually their stunt doubles.
Jonah Hill lost over 40 pounds for his role since he and Channing Tatum are required to do a number of physically demanding stunts.
Channing Tatum passed on the movie twice before he was convinced by Jonah Hill to take the role
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