Question: Instead of Frank giving the wallet with the fingerprints to John in the future, why didn't Frank just give the wallet to the police in his own time?

dan coakley..

Chosen answer: They couldn't be sure that the police wouldn't lose it or turn it in when the owner showed up. Or, since we find out that the killer is a cop, he could have just taken it back from evidence).

Captain Defenestrator

Question: How did John's father appear at the end of the movie as an old guy? It's very confusing to me, can someone please explain how that worked?

dan coakley..

Chosen answer: His son prevented his death in the past. By warning him about how he originally died in that fire and changing his decision, and then convincing him to stop smoking so he doesn't die of lung cancer. He prevented his past death, so suddenly he was still alive in present time.

Quantom X

Question: What is the point of Dennis Quaid throwing his helmet out the window when the factory is on fire in the beginning of the film?

Chosen answer: Firemen never get rid of their gear in a fire, especially not a helmet. He was unable to reach via radio his crew and when he threw his helmet out the window, it told his crew that he was in trouble and what his position is. They also then have a clue that he is still alive.