Revealing mistake: "The Crash": Due to the use of both models and stock footage, what is supposed to be one airplane has three very different appearances. As the passengers board, we see the "real" plane. In the air, it's another plane altogether (stock footage). When it crashes (a model), it looks completely different yet again.
Revealing mistake: About 20 minutes in, the cops have a newspaper with the headline about the two guys they killed. They turn to page two which has a story about the next guy they are planning to kill. If you look at the picture, it is glued onto the story page. The left side is lifted. The actor must have been hired after the printing.