Did You Know?
- The film took twenty-five days to shoot.
- During Teddy's line "You don't have a clue, you freak!", director Christopher Nolan felt that Joe Pantoliano (Teddy) did not quite nail the end of the line, so he decided to re-record the last two words to his liking, delivering them himself. Therefore, in the final film, the words, "you freak", as we hear them, are actually being said not by Pantoliano, but by Nolan impersonating Pantoliano's voice. Pantoliano was unaware of the dubbing until an interview for Anatomy of a Scene: Memento (2001).
- Stephen Tobolowsky has stated that during his audition for Sammy, he had mentioned to Christopher Nolan that he had experienced amnesia personally. A few years earlier, he was given an experimental pain killer that induced amnesia for a surgery he had undergone. Tobolowsky said it may have helped him get the part, because no other actor would likely have had his first-hand experience.
- According to Christopher Nolan, Carrie-Anne Moss shot her whole part for the film in eight days.