Factual error: When Marty goes to meet Mad Dog Tannen for the duel, in the background on the right side is the current flag of California. But that flag did not become the state flag of California until 1911, so would not have been around in 1885.
Marty returns to 1985 and the DeLorian is distroyed by a train. Doc builds a new time machine in 1885 and visits Marty. Doc is married with two sons named Jules and Verne. Marty doesn't race against Needles and thus doesn't crash into the Rolls-Royce, and so he doesn't get into the job that he gets fired from.
Trivia: When filming the scene where Marty is being hanged from the clock tower, Michael J Fox agreed to really hang from the rope. Whilst filming, Fox held the rope away from his throat with his hand. At one time he wasn't holding the rope and was really being strangled. The film crew didn't realise, they just thought it was really good acting, until he passed out.
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