Miscellaneous When Ig tells his brother Terry to swallow all his pills, Terry puts a few in his mouth and uses the little bit of liquid in his glass to swallow them. There shouldn't be any liquid left after that. In the next scene with Terry, the glass is full as he swallows more pills.
Revealing Mistakes The film is set in Washington state (witness the car license plates), but when Ig drives into town near the start of the movie, we can see a branch of the Canadian Imperial Bank of Commerce on the right side of the street.
Despite playing former middle school classmates, Michael Adamthwaite is 8 years older than Daniel Radcliffe.
Daniel Radcliffe in the film uses snakes much like Harry Potter who could speak to snakes who was also played by Radcliffe.
The name Merrin played by Juno Temple makes reference to Father Merrin played by Max Von Sydow of the Exorcist franchise.
The four main roles are all played by British-born actors.
Shia LaBeouf was originally cast in the lead role but he was replaced with Daniel Radcliffe.
The movie is based on the Joe Hill (Stephen King's son) novel Horns.
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