Colter calling his dad without telling him who he is. Doubles as a Tearjerker.
Colter getting the bitter man on the train to start his standup comedy routine.
The freeze-frame at the film's climax. For one moment, everyone is happy and it's a beautiful day.
And then everything keeps going, proving that Colter's actions did make a difference.(..in an alternate reality, with that universe's Colter still stuck in the program, awaiting a mission, and "our" Colter now stuck forever in the body and life of Sean, who has had to essentially die to save everyone else on the train. But we're not gonna think about that right now.)
