Other mistake: After the scene where Norman texts Bradley that he is coming over, the next shot is Norman looking at the small transcript of his messages to her. If you look, you can see that the transcript starts at 2:34 PM. However, it's nighttime. You can even see the time says 2:34 PM at the top of the phone screen. Also, the original text of 'Hey' is missing although he texted her immediately after receiving it with 'I want to come over and see you.' (00:37:40)
Other mistake: James 'Big Jim' Rennie shoots at a picture of him and his son sitting on a table next to a yellow wall. After he shoots the picture he picks it up. When he does that there is no bullet hole in the wall behind the picture. (00:43:00)