Other mistake: Beth gives Nick his keys, saying he left his keys at her place, meaning they're his keys, but then she takes them with her, and those were the same keys she had in her pocket when she was shot.
Other mistake: Penny comes into Karen's room to check on her, and Karen is surprised to see her there. So Penny obviously let herself in somehow, but we see in the next scene that the alarm is on, and Penny does not know the code. If she does not know the code, there's no way she could have got into the house without Karen knowing. Even if Penny had a key to Karen's place, she would have set off the alarm.
Other mistake: Jack's slap across Nick's face didn't make contact. (01:25:40)
Other mistake: After LT gets the $30,000 off the drug dealer he goes to one of his girlfriend's apartments and as he walks through the bedroom the cameraman accidentally bumps into him. You can even hear it. (01:04:07)
Other mistake: The newspaper at the gas station is dated 1962. The movie is set in 1969. The problem with this is that in the beginning, the narrator mentions that the Fisher incident happened 10 years before they moved to Novato. It has only been 7.