Green for Danger (1946)

Continuity mistake: The postman hangs his bag to the hook on the wall. By the noise, he knows a split-second in advance that an explosion is about to happen, and ducks. The actor ducks out of view; we are not supposed to notice that once he disappears, film editing inserts the part when the background partially detonates. We however do, because the bag in the foreground changes position in the space of a single frame. (00:05:25)

Sammo

The Hospital Staff - The Doctors: Dr. Barnes: Did you get us here just to insult us?
The Police: Inspector Cockrill: No. I only like to strike an informal note.