Other mistake: The lodge the guys are staying in is called The Silver Peaks Lodge. However, in the scene where Nick is confirming his reservation, the sign behind the clerk with the goatee reads The Silver Peak Lodge [singular].
Hot Tub Time Machine (2010)
1 other mistake
Directed by: Steve Pink
Starring: John Cusack, Chevy Chase, Crispin Glover, Rob Corddry, Lizzy Caplan, Craig Robinson, Clark Duke
Factual error: Blaine (from the ski patrol) mentions "21 Jump Street" in 1986; that show premiered in April 1987.
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Trivia: When the foursome ski down the mountain and are looking around at the oddly dressed people, someone behind John Cusack says, "Hey Lane, you owe me two dollars". This was a nudge to John Cusack, who played Lane Meyers in "Better Off Dead" and was pursued in the snow by a crazed paper boy shouting "Two dollars!"
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Answer: It's just the rule they used for the movie; not a lot of thought was put into the time-traveling rules with the obvious inconsistencies the movie has throughout regarding it, especially in the ending.
lionhead