Directed by: Richard Donner
Starring: Bill Murray, John Glover, Karen Allen, John Forsythe
Question: When Frank travels into the future and sees an older Calvin sitting on the floor, Calvin glances up. Did Calvin see Frank?
Question: What are the girls doing when they throw Grace's son onto the kitchen floor? Why are they harassing him, and why is their grandmother enjoying it so much?
Answer: They are blowing a 'raspberry' on his bare belly, just good-natured teasing of a younger sibling.
Continuity mistake: When Frank sees what he thinks is the Ghost of Christmas Future in the elevator, he flips out and accidentally clocks Grace in the jaw. She puts her right hand to her face, but in the next shot she's holding her left hand up.
Earl Cross: Here Francis, I've got something for you. Merry Christmas.
Frankie Cross: A choo-choo train?
Earl Cross: No, it's five pounds of veal.
Frankie Cross: But Daddy I asked Santa for a choo-choo.
Earl Cross: Then go out and get a job and buy a choo-choo.
Trivia: When Frank throws water on a waiter he thought was on fire, he apologizes and claims he thought the waiter was Richard Pryor. This is a reference to the time Richard Pryor, while doing cocaine, set himself on fire and ran down a busy street in L.A.
Answer: It's a vision, not reality, so one could interpret it either way. I think it's more powerful if Calvin is seeing Frank, silently accusing him of being (at least partially) responsible for his (Calvin's) situation.