Plot hole: The first time David werewolfizes, he's reading a book in the brightly lit apartment. Exterior shots of the full moon show it's nighttime out, so the lights inside the apartment must be on. But when Dr. Hirsch calls to check on him, the shot is of the phone ringing, unanswered, in the completely darkened apartment. That's considerate, David. Even as a werewolf, he must have run around turning lights off before going on his rampage.

An American Werewolf in London (1981)
1 plot hole
Directed by: John Landis
Starring: Griffin Dunne, Jenny Agutter, David Naughton, Brian Glover, David Schofield, Joe Belcher
Continuity mistake: The level of liquid in the doctor's beer mug changes noticeably between shots; the mug fills itself up again just before he leaves the pub. (00:47:10)
Alex: David, please be rational. Let's go and see Dr. Hirsch.
David: Yeah, be rational. Sure. I'm a fucking werewolf, for Christ's sake.
Trivia: When the movie was first shown in theaters, the marquee read, "From the director of Animal House...A Different Kind of Animal." This lead many movie patrons to believe that it was another comedy film. People ran out of theaters in terror when they realised it was a horror movie.
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Chosen answer: David has his eyes closed because of the excruciating pain he's experiencing. His eyes open to see his hand change because it's cinematically and visually cool to see his own reaction to what's going on. That's how director John Landis directs!
CCARNI ★