Trivia: At the end of this episode, Homer has a barbecue with a banner that reads "Homer's 305th 'Everything is Back To Normal' Barbecue", even though this is the 306th episode. This is because everything was not back to normal at the end of Who Shot Mr Burns? Part 1, the only Simpsons cliffhanger.
Question: Homer travels back in time and causes changes by what he does in the past, like stepping on a bug. I once saw a movie with the same basic plot: some people travel back in time and are told to be careful not to disturb anything, but when they return to their time everything has changed. In the end they discover it was because they stepped on a butterfly. Does anyone know the name of this movie?
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