Continuity mistake: When the bad guys are clearing the mall, the camera follows "Rudolph" as he clears an exit on his skateboard. As he starts to clear the exit a young man with a black jumper with a white top half can be seen on his feet moving away. In the next shot he is sitting down with a bag on a bench and then gets up to leave. (00:39:35)Jockman70
Other mistake: When Paul is putting on the Hello Kitty bandaid, you can see the outline on his skin from another bandaid, from previous takes of this scene.
Continuity mistake: When Paul and the guy are fighting next to the air con intakes, the speed that the fan is spinning changes between the close and far shots.
Other mistake: The glass in elevators is tempered. It would not have shattered when the robbers pursuing Paul crashed into it.
Other mistake: When Blart and the SWAT guy are pursuing the bad guy, they have a blue police light on top of the car (the magnetic kind). Interior views of the car show blue flashes on their faces, which is impossible with the light being on the roof. The exterior shots confirm that the inside of the car is completely dark. (01:21:30)RoyT
Other mistake: In the beginning of the movie, Paul is at the NJ State Police training grounds. The training grounds, while near the ocean, do not have any islands just off the coast, nor is the ocean water nearby. The police cars used are painted light/metallic gray Massachusetts State Police colors with a blue stripe down the side. NJ State Police cars are white with red or red/blue lightbars with a blue & gold triangle logo on the front doors.
Continuity mistake: When Paul hides halfway in the air duct, his feet are hanging down when seen in the exterior shots. When seen from inside the duct, his feet are tucked up behind him.
Continuity mistake: In the beginning scene, as Blart passes out, another trainee gets off the rope and starts running. The camera cuts to Blart's face for a second, then back to the trainee starting to run. The trainee should have already been running.