When Paul gets hit with the spray tan, a lot of it winds up on his white shirt. Later, when he and one of the robbers fall through the ceiling and into the plastic ball bin, Paul's shirt shows no trace of the spray-tan. In the next scene, however, his shirt is once again covered with tan residue.
When Paul Blart is trying to run through the glass doors to pick up a birthday-card you can see how his radio is secured on his right shoulder. When he falls backwards you can clearly see how the radio falls off. But directly in the next shot it's back on his shoulder.
When Paul Blart stops the old man on the disability scooter, the old man drives away and the scooter pushes Blart over, then he drops his book and walks away. However, he has the book again later in the film.
In the scene where Paul is training Veck, Paul hands him a cup of coffee so he can stop a man who is speeding. Veck holds the cup in his right hand in one shot, and is now holding it in his left in the next.
When Paul is leaving the bank, he is noticed and the hostages are sent to the back room. However a few scenes later when his daughter is captured and brought in you can still see the hostages in the background where they were before.
In the scene where Chief Brooks hands Sgt. Howard the notebook with a list of clever comebacks, the hand that takes the notebook appears far too old to be Adam Ferrara's. According to the DVD/Blu-ray commentary, that hand is in fact producer Barry Bernardi's.
Legal Seafood is seen twice as a restaurant at the mall. There is no Legal Seafood restaurant in West Orange, New Jersey, according the the chain's website. There are many, however, in Massachusetts where this movie was filmed.
All of the police vehicles in the movie are shown with all blue emergency lights. In New Jersey the display of blue lights exclusively is reserved for volunteer firefighters and volunteer EMS personal vehicles. A New Jersey driver would recognize the minivan with the blue throw light Paul and Jimmy were driving as a volunteer responding to a call, not a police vehicle.
New Jersey State Police vehicles are white with a blue and gold stripe descending diagonally from the upper left hand corner to the lower right hand corner of the door (driver side door) with a gold triangle with New Jersey State Police in blue letters inside of it.
Paul Blart is playing the guitar and microphone for Rock Band in an arcade. While the microphone can be used as a tambourine or cowbell, the television screen shows somebody is tapping the microphone, but nobody is near the microphone.
The movie was supposed to be taking place at the West Orange Pavilion Mall in New Jersey during the Christmas shopping season. Several windows depicted bathing suits, bikinis and even summer wear in their windows, along with beach towels, (part of the movie was filmed at the Burlington (MA) Mall during the summer), whereas other stores, such as Macy's had window displays of Christmas and New Year's Eve apparel in their windows.
When Paul is in American Joe's participating in the nacho eating contest, he grabs a glass with ice in it to pour a drink. After he pours the drink, the "ice" stays on the bottom of the glass, as the cubes were likely made out of glass.
When Paul is in the Elevator and a bad guy smashes through the window, the glass breaks into large, sharp, and seemingly very thin pieces. In real life, for safety reasons the Elevator would have tempered glass, which breaks into thousands of small chunks and the glass would be much thicker.
Some shots of the mall interior after the thieves had taken it over show the stores and kiosks shuttered. While it's possible that store employees had shuttered their stores and evacuated through rear service passageways, the shuttered kiosks suggest those retailers had taken the time to close up before evacuating.
When Blart puts the "Hello Kitty" Band-Aid on the small cut on his arm, it is apparent there were multiple takes of this scene. The skin the Band-Aid covered is much cleaner than the surrounding tissue and the imprint of the Band-Aid from previous takes is very apparent as he puts the Band-Aid on in the shot used in the movie.
As the film progresses, the amount of light during the outdoor scenes varies. In some indoor scenes, which are supposed to take place after the mall has closed at night, bright sunlight can be seen shining in the doors from outside.
When Paul crashes into the minivan while seeing Amy for the first time the minivan appears to be a light blue or a silver van. This color van is showing in several parts of the movie. When Paul finally meets Amy at her shop she asks him if he was the one that ran into the van the other day. He says no, which van. She points to the van that shows a dent in the back. The van shown with the dent was a aqua or dark teal color van.
When you see Paul grabbing different things to get ready for his ambush on the bad guys in the Safari Resauturant, you see him drive by the card shop several times. Each time he drives by you see where 'Bath and Body Works' in the background is reversed, reading backwards. When he finally rams into the doors to crash through, they are on the other side of screen, in the correct reading order - revealing that they flipped the shot when editing the film.
When Vecks, Amy and Mia exit through the "Restricted Access" door they exit to the outside. International Building Code requires that all egress doors shall open without a key and without any special knowledge or effort. The door would not have an access key to exit the building as this is a fire and trap hazard, and the panic bar would have collapsed when Paul Blart pushed on it (it was locked in the collapsed position). This door violates all aspects of egress code with the exception that it does swing outside.
When a motor vehicle is placed inside of a mall as a prize, most fire codes would make you disconnect the battery and have no gas in the tank. The mini van could not have started and drove for that long of a time. Plus, where did the keys come from?
When Paul crashes down from inside the air conditioning duct he knocks out Vixen. Vixen blinks several times as Paul attempts to pick her up and place her in the dressing room even though she is supposed to be unconscious.