When Chuck is searching for the key in the baggage rack, he is wearing a (wedding) ring. In the next shot by the coffin it is gone.
The champagne glasses the stewardess gives Chuck and Hannah are clearly chilled, but in the reverse angle, when they are holding them, they are clearly not chilled.
When Morgan enters the break room, he unplugs the heating element from the door handle. When everyone exits the break room, the element is still glowing red, as if it were still plugged in.
Shaw tells Chuck to stay on the plane. You cannot stay on the plane on any international flight once it has landed. You must disembark. If you are returning on the same plane, you then re-embark.
(Roughly at 11:10) When Casey is opening the Super-Claw game, the locking mechanism for the door is already unlocked, the handle is sticking out.