Audio problem: When Cutter rolls and shoots at Vincent, we can hear the distinct sound of his pistol. However, we see a shot of the pistol's slide in the open/locked position, meaning he's run out of ammo, but we can still hear the pistol being fired a few times after that.

Passenger 57 (1992)
1 audio problem - chronological order
Directed by: Kevin Hooks
Starring: Wesley Snipes, Tom Sizemore, Bruce Payne, Alex Datcher

Continuity mistake: Liz Hurley shoots one of the FBI agents seated next to Rane, in the background the other agent can be seen with make-up on waiting to be shot next. Then the angle changes and his blood has vanished.
Charles Rane: You wouldn't take advantage of a helpless man.
John Cutter: Never stopped you.
Charles Rane: It's the American way, isn't it, brother?
Trivia: FBI Agent Dwight Henderson is portrayed by Robert Hooks, the father of director Kevin Hooks.
Question: How did the FBI agent know that the two FBI agents on the plane were killed earlier?
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Answer: It's been a while since I've watched this movie, but he obviously knows the plane is hijacked. It's a pretty safe assumption that the agents are dead as they're escorting a dangerous, high profile prisoner. Pretty easy to connect the dots. Alternatively, they could've failed to check in, and he assumed the worst.