Continuity mistake: When Sean is introduced for the first time, there's an obvious continuity issue with Blake Lively's hair over her right shoulder. (00:12:00)
Visible crew/equipment: When Ling leaves the apartment building after hitting the Dean and his wife with a bat, a crew member holding a radio can be seen standing next to the door just as she walks out the doorway. (03:03:35)
Continuity mistake: The day after the robbery, Jacob is in his kitchen watching the news when his wife asks how he is. He says he's okay, he things and has his hand on his chin. In the next shot just before she continues talking, suddenly his hand is down. (00:23:15)
Continuity mistake: After the first shoot out, the thieves take the armored truck and drive off. The black sedan they have with them is driven behind them and is shot up pretty bad. As they exit the parking lot of the donuts shop, the red covers on the tail lights are missing/falling off. But both tail lights are seen on. A few shots later it's driving behind the truck and now it's left tail light is out with only the right one on. Then as a shot from in front of the truck pans past them the car drives by and you can see it's left tail light is not only on, but intact and has the red cover on it once more. Yet then as the car is pulling into the garage of the hide out, both tail lights are now shot out. (00:06:05 - 00:07:15)
Continuity mistake: When Jason lunges at Batman with his knife, there is a pile of garbage by the wall where he lands. In the first shot the barrel by the garbage is wooden. But in the next shot it's suddenly a metal barrel/drum. It then changes back to a wooden barrel again. (00:04:20)
Factual error: Rhianna is watching a live feed of a man's office via webcam. We see a closeup of the screen. At the top it shows the filename being a ".jpeg." Jpegs are still image files, not movies, let alone live streams.
Continuity mistake: Velma reluctantly agrees to Daphne's idea to check out of the mysterious locker. She says "We'll come up with something." Right part of the frame, and in the background there's an extra (black kid with a plaid white shirt) that is simultaneously also eating at the table in the reverse shot. (00:31:15)
Continuity mistake: After Gillick saves Isabel and they get into the car, the seats in the car don't have any head rests. But after they turn, and the camera shows them in the car again, the headrests are there. (01:02:55)
Continuity mistake: When they are first fighting, Will throws Ben onto the dishwasher. And as he rolls off it, there is a blue plate with a wooden spoon sitting on top of it. When Ben turns and grabs for a knife in the dishwasher, suddenly the blue plate is gone and replaced by various tupperware, and the wooden spoon is now standing up in a slot. (00:24:10)
Continuity mistake: Nice draws a line in the asphalt of the secret passage (cool idea, although there's no way that the bad guys can actually see that especially at a distance!). In the first overhead shot, there's a gap in the line. When the line is shown again next with the first baddie croaking before it, the line has already changed. (01:15:45)
Continuity mistake: When Phil heads to the Puppet Pleasure place early in the film, the positions of the shadows change around the vehicle parked out front in the close up, revealing the time laps between filming each shot. (00:06:30)