Plot hole: Near the end where Adam Sandler's girlfriend tells him that the anger management was a set up, Sandler asks about the air stewardess incident and she says that it was all a set up, however, the cocktail waitress incident isn't mentioned and surely his girlfriend couldn't have arranged that, therefore it was in fact a coincidence that everything worked out in the end.

Factual error: In the scene where the young Dave is being embarrassed, his's underwear show the new Fruit of The Loom logo on the waistband. In the late 1970s, children's Fruit of The Loom underwear just had two parallel horizontal lines on the waistband.

Continuity: When Stacy tells her story in the first fury fighters' meeting, her hair changes several times between covering her medallion and not covering it.

Continuity: After the first fury fighters' meeting Buddy declares Chuck as Dave's anger ally. Chuck wants to give Dave his phone number, pulls out a letter to his father he had started, puts it back in the pocket, then takes out a smaller piece of paper with the number. Then he walks off with both hands empty, but when the camera angle changes he is seen waving back with a piece of paper which, sizewise, looks very much like the one he had given to Dave.

Audio problem: When Buddy drives off from the monastery we see the wheels digging into the gravel, but the sound is that of burning rubber on asphalt.

Continuity: When Buddy and Dave start running away in the monastery the monks are right behind them, running at the same speed. When they reach the car a few seconds later the monks are at least 100 meters away.

Continuity: When Buddy comes to Dave's cubicle Meatball the cat sits there absolutely quietly but the beret on his head moves back and forth in alternating shots.

Continuity: In the restaurant, before they get into the fight with the bald guy and the blind man, when they are sitting down, you see the same lady in a black miniskirt walk past John Turturro twice.

Continuity: In the scene with Dave and Chuck at the bar, when the camera is on Chuck before he picks up the fight, we twice see the arm of the same person opening the door and holding it open without walking in. (The black and white sleeve has a strange resemblance with Lou's from the fury fighters' meeting scene, and it looks a bit as if he opened the door but realized that he had no business being on the set.)

Deliberate "mistake": Near the end of the movie, in the Yankee Stadium scene, Adam Sandler sneaks onto the field. He then assaults a police officer and announcer who try to stop him. Rudolph Giuliani condones, even encourages Sandler's behavior. Giuliani acted entirely out of character, as he has an extensive history of being staunchly anti-petty crime and pro-police officer.

Continuity: In the Yankee Stadium scene, Adam Sandler has to kiss Marissa Tomei to get her to marry him. At first, she looks like she is a long way away but it takes only seconds for them to be right next to each other.