Continuity mistake: Right after Jim has his nightmare while sleeping in the car, he looks around for Grace, who is standing outside the car looking at scenery. When Jim sees her, she has her arms crossed over her chest. The next shot, with Jim walking around the car, she has her arms by her side, and immediately after, the shot with Jim approaching her, she has her arms crossed again. All this took place in about 2 seconds, not enough time to drop her arms and recross them exactly the same way as the first shot.
Continuity mistake: After the initial fight scene in the car with John Ryder, after he is thrown out of the car, the next shot shows the car driving off at normal speed, outrunning him. But in the next shot, he is shown coming to his senses and the car goes by him again as if he, when falling out of the car, tumbled very fast in front of the car when in fact he should, just as anything falling out of a moving car, tumble backwards. So there is no way for the car to go by him after he was pushed out.
John: How long you been fucking her?
[Jim looks awkward.]
John: It's a simple question.
[Jim looks down and sees John's wedding ring.]
Jim: How long you been fucking your wife?
John: I don't have one.
Jim: then why are you wearing a ring?
John: It makes people think I'm trustworthy.
Jim: Aren't you?
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