Emma Roberts was originally cast but the film required her character to indulge in a three-way sex scene, causing her to drop out of the film due to unspecified "creative differences." She was replaced by Ashley Benson.
The gun barrel blow job scene arose form improvisation on set. Harmony Korine suggested the girls emasculate Alien by sticking the gun barrels in his mouth. It was then James Franco's idea that Alien would get turned on, leading him to perform oral sex on the guns.
Selena Gomez was encouraged by her mother Mandy Teefey to go personally to Harmony Korine's house to audition for the movie.
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