Other mistake: When Arthur's father takes his ball away (just before Richard Collier signs the register), Richard is looking the other way while Arthur's father puts the ball somewhere behind the counter. Yet, when Richard decides to give Arthur his ball back, he reaches over the counter to the exact place Arthur's father placed it even though Richard never saw where it was placed. (00:54:30 - 00:57:10)
Somewhere In Time (1980)
1 other mistake - chronological order
Directed by: Jeannot Szwarc
Starring: Christopher Plummer, Christopher Reeve, Jane Seymour, Teresa Wright
Factual error: In scenes that take place in 1912 on the porch of the hotel you can sometimes see American flags in the background. The flags in the movie have 50 stars. The 50 star flag wasn't adopted until after 1959. (01:25:15)
Richard Collier: I owe you an apology. I understand you now. You have nothing but the best motives in mind for her, but so do I.
Trivia: When Richard Collier leaves the men's room, bloodied from his first encounter with a straight razor, the bearded man who stares at him in the hall and declares, "Astonishing!" is screenwriter Richard Matheson in a cameo role. His screen credit at the end reads "Astonished Man." (01:01:55)
Question: When Richard accidentally pulls a coin out of his coat pocket, he sees that it's a penny and he is sent back to his own time. After being weakened upon his trip back to the future, why, after what was likely several days to get his full strength back, wasn't he able to return to the past? His mentor told him returning to his own time would leave him weakened but, given enough time to get it back, he could have gone back to the past again.
Answer: He was no longer able to put everything out of his mind, which was a requirement to successfully time-travel. He was distraught and unable to focus enough mentally. He stopped eating, and as time went on he became weaker and weaker.