The moment of cross-cultural exchange when the defecting Russians bawl their eyes out at E.T. and the other American movies they watch, courtesy of Jonesy.
The size of the teddy-bear Jack bought for his daughter, seen at the end of the movie when he's on the flight back to Britain.
It's the same bear John McClane was bringing his kids at the beginning of Die Hard, also directed by John McTiernan.
Also, the fact that he's actually sleeping on the plane, something he was unable to do earlier. It shows just how tired he is after his ordeal, and it's heartwarming because you know he's earned his rest.
Ryan and Ramius' conversation in the end:
Ramius: Do you still like to fish, Ryan? There's a river not unlike this one in Vilnius, where my grandfather taught me to fish. "... and the sea will grant each man new hope, as sleep brings dreams of home." Christopher Columbus.