Continuity mistake: The plane they are on changes several times throughout the movie. When it is sitting at the gate in Dallas, and while being pushed back from the gate, it is a Boeing 737. When it is shown taxiing out, it is an Airbus A320. Air to air shots are of a Boeing 767, which is also the same as the interior shots all throughout the movie. The 737 and A320 are narrowbodies, while the 767 is a widebody, commonly configured 2-4-2 like the interior in the movie.
Revealing mistake: When Lisa stabs Jackson in the throat with the pen, if you watch closely, you can see that she is still holding the pen when she pulls her arm back, but in the entire rest of the scene the pen is still stuck in his throat. If you watch it in slow motion, the mistake becomes even more obvious.
Continuity mistake: When Lisa is on board the plane, she is wearing stiletto heels (best seen when she is collapsing in the bathroom). However, when she is running through the airport, she is wearing flat shoes. This is most easily seen when she comes of the transporter belt, when she trips and one of her feet swings into the air. Later, when she kicks Jack on the stairs of her house, she is wearing stiletto heels again.
Trivia: When in the plane's bathroom, in an early take Cillian Murphy threw Rachel McAdams so hard against the bathroom wall that he knocked her unconscious. If you look at the shot used in the movie where he throws her against the wall, you can see his hand in her hair protecting her head so he didn't hurt her again. Not a mistake, as he's not trying to knock her out in the film, just rough her up, but worth looking for.
Lisa Reisert: Is it Jack for short?
Jackson Ripner: No. I haven't gone by Jack since I was ten years old. Last name's Ripner.
Lisa Reisert: Jack Ripner... Jack the... Oh!
Jackson Ripner: There you go.
Lisa Reisert: That wasn't very nice of your parents.
Jackson Ripner: That's what I told them. Before I killed them.
Question: I don't understand parts of the scene where Lisa runs over the hit man. The hit man is just standing outside the door for some reason. After Lisa runs over him she runs inside the house and her father said he called the police already, why did he call them? The hit man was just standing outside waiting for the call, her father didn't know what was going on. Did he call the police because she drove into his house, even though there had only been a few seconds in between scenes?