Fantastic Four

In the trailer for the upcoming movie Fantastic Four, there is a very telling keychain.  On the rear view mirror of his car, Johnny Storm aka the Human Torch played by Michael B Jordan has a fire flower keychain.  The fire flower being the classic power-up from Super Mario Brothers.  Not only does this reference the human torch's power to control and emit fire but it represents the fact that this Fantastic Four is made up of younger people. 

Cast Away

Chuck Noland (played by Tom Hanks) has a swiss army knife keychain.  Right before his ill fated plane flight he gives Kelly (helen hunt) an engagement ring and his keys.  When he finally returns home she gives him the keys back.