Revealing mistake: When Doug 2 wakes up and sees Doug 1, Michael Keaton's body double is noticeable in the angle shot from behind - he has bulkier hair.
Multiplicity (1996)
1 revealing mistake - chronological order
Directed by: Harold Ramis
Starring: Michael Keaton, Andie MacDowell, Katie Schlossberg, Zack Duhame
Continuity mistake: When Michael Keaton is talking to his wife he picks up Froot Loops, then a second later he picks up Cheerios.
More quotes from Multiplicity
Trivia: Michael Keaton is seen wearing a Penn State hat. Keaton was born in Pennsylvania and is a long time resident of Pittsburgh, although Penn State is not his alma mater.