When John Parse is being mutilated, his skin in the close-up shots of the wounds on his face looks completely different than it does in the rest of the scene. Mainly, it has a different color and is much smoother.

Although the film is set in 2008, the song "Dead of Night" by Orville Peck, released in 2019, is heard when Colin arrives at his house. However, the film is set in an alternate 2008, so the time line in which that song was released could be different.