Continuity mistake: When Bruce is covering the boy while trains are passing either side of them, at first he has his right hand on top of the boy's head. Then in the next shot he has his hand to the side of his head in a different position. The film cuts back and forth between these shots.
Continuity mistake: When Puzzleline gets the first call from Simon and Leo records what is said, when he is playing it back to the other technician, what is said is different. There are no cutaways, and no editing, but in the playback, Simon doesn't say that he got the number from "Puzzle Nine-Nine."