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.
Back to the Future Part III (1990)
Plot summary
Directed by: Robert Zemeckis
Starring: Christopher Lloyd, Michael J. Fox, Mary Steenburgen, Lea Thompson, Thomas F. Wilson, Elizabeth Shue
Though Doc asked Marty not to come back for him, Marty does go back anyway, because he and the 1955-Doc find out that Emmet Brown was killed shortly after the writing of the letter (by Mad Dog Tannen, the great-grandfather of Biff).
Right after the time-jump, the DeLorean is attacked by Indians who put an arrow to the gas tank, the fuel goes away.
Doc finds a way to solve that: they must kidnap a train and accelerate with that above 88 mphs.
Doc saves the new teacher of the town, Clara Clayton, who was supposed to die, and falls in love with her.
More mistakes in Back to the Future Part IIIMore quotes from Back to the Future Part III
Trivia: Director Robert Zemeckis asked for Clint Eastwood's permission to use his name for BTTF 3. Clint Eastwood felt so honored that he said yes.
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Answer: He simply has an absurdly low tolerance for alcohol, and whiskey is not a wise choice if this is the case. It helps set up the joke when Marty asks the bartender, "How many has he had?", and he replies by telling Marty, "Just the one", as we are meant to think Doc has been in the bar all night drinking away his sorrows.
Jazetopher