Continuity mistake: A car and a truck are parked in the driveway when Billy approaches and hugs his mother, but the vehicles are not there when the camera shifts to a close-up of them hugging. (00:05:34)
Continuity mistake: A vast majority of the movie occurs over the course of a single day, so it would be expected that Becky's hair stayed about the same. However, there were frequent fluctuations in Becky's hair's length, how her bangs were arranged, and color (whether the blue streaks could be seen at all or how much at a given time, and if she had dark roots on the top of her head).
Continuity mistake: When Johanna and the Captain are being chased by Mr Almay and his associates, their position in the wagon changes. First Johanna is on the Captain's left. Next shot she is on his right. Next shot she is back on his left. (00:42:14)
Continuity mistake: When Nick leaves to deliver presents he walks out the door and you hear the door close. When his wife goes after him with the flask you see him opening the very same door he's just walked out. (00:24:50)
Continuity mistake: The color of Lance's clothes change from a dark tan, brown, or grayish color on the train to blue walking through the train station and riding to Jack's place. Lance also has his jacket on the entire time - until he is at Jack's front door (where the jacket is no longer visible). Jack kept his coat on in the car, his apartment, and to play cards. (00:03:44)
Continuity mistake: In the locker room, an adjacent locker is closed then open with a yellow shirt hanging inside. Also, Ali takes a uniform jacket out of the locker Borz said she could use and holds it in front of her while they were talking. When they're almost done, Ali is turned around toward the locker and starts to remove a uniform jacket from her locker (as though this is the first time she was seeing it). (00:10:52 - 00:11:35)
Continuity mistake: The kids are in the car with their dad, and despite the best efforts from the youngest, they are reached by his teacher. As the dad starts the "You were killing us" joke, his hand is on/off the steering wheel between shots more than once. (00:07:15)
Continuity mistake: Whilst Jung-seok is driving with his family on the first day of the zombie outbreak, after he says "All other roads must be blocked", his sister looks to the left to face her son in the back seat. The shot then cuts to focus on Jung-seok, and the sister can now be seen looking straight forwards out the window. (00:01:45)
Continuity mistake: Mikey and his friend are smoking the same inch-long joint by the back door which gets passed back and forth - no way they could keep holding/smoking it for that long given how short it was to start with. (00:04:50)
Continuity mistake: Kareem's mom is talking to her coworker about the fact that her son asked for James to pick him up at school. When she mentions that it's not seen as the coolest thing to date a cop, and a white one at that, her friend goes from hand low, to smoking with that hand, to drinking from the cup, in the span of a few words and a couple quick cuts. (00:09:45)
Continuity mistake: First argument. Leilani shouts "Why are you being so loud right now?", with a hand behind her neck. She does not start the next shot in that position, she puts her hand there only a second later. (00:04:05)
Continuity mistake: When Driscoll is walking out to his car with his son, you see the driver's side window is rolled all the way up. When he sees Spenser and goes to talk to him, the window is now rolled down, even though he didn't do anything. (01:22:00)