Continuity mistake: When Jen is driving her Volvo convertible, she gets stopped by one of the neighbours. Just before she gets stopped, you can see the back window is up. When the camera shows Jen talking to the neighbour, the window is now down, and when Jen drives away, the window is now back up again.
Continuity mistake: In the final scenes with Tom Selleck confronting Ashton at gun point several times it shows Tom pointing different guns, apparent by the different size barrels. (01:27:28 - 01:27:55)