Continuity mistake: After the first court case Dave walks upstairs to meet Buddy. When he comes through the door he is holding his verdict papers in his hand, which he didn't have with him when he was downstairs. (00:08:40)
Continuity mistake: When Dave and Buddy sing "I am pretty" on the bridge the window is visibly closed, only during their arguments with the drivers who go by (especially the taxi guy) the window is open. (00:33:05)
Continuity mistake: When Chuck is assigned as Dave's anger ally he puts his hand on Dave's shoulder from the side. When the camera shows them from behind his hand is on the back of Dave's shoulder. (00:17:40)
Continuity mistake: When Dave throws the bully-turned-monk Arnie Shankman down, Arnie's head lands on the gravel and his robe under his body. Before Arnie gets up there's a close-up of his head with his robe partly under his head. (01:05:45)
Continuity mistake: When Dave approaches Buddy in the Community Center there's a white painted brick wall in the background. When the camera angle changes the wall is covered with a colorful carpet. (00:08:55)
Continuity mistake: When Dave drives up the parking garage of the Yankee stadium we see him coming up the ramp to the upper level. Then the camera cuts to the side and he is seen passing by a row of parked cars which weren't there before, then it cuts back to his car still on the same ramp. (01:23:55)
Continuity mistake: When Robert Merrill walks up to the microphone in the Yankee stadium it's fixed on a black stand. When Dave spots it we see a close-up where it's fixed on a silver stand. Later, when he snatches it away from Merrill it's on a black stand again. (01:24:45 - 01:25:45)
Continuity mistake: After Adam Sandler gets the brownies thrown at him by the girl in the red dress, you can see that there are brown spots all over his jacket. When we next see him, (in the scene with Jack Nickolson) there is no sign of there ever being any brownie on him at all.
Continuity mistake: When Dave and Linda talk at Dave's apartment about Andrew's 'thing' Linda puts her bag on the kitchen table. When she puts her jacket on top the bag is turned by 90 degrees. (00:20:00)
Continuity mistake: When Buddy stays over night at Dave's place the first time Dave ends up sleeping on the floor with his teddy in his arm. When Buddy wakes him up and takes a picture the right arm of the teddy points into different directions from shot to shot. (00:29:30)
Continuity mistake: The cabin of the airplane is that of a 767. The shot of a flying plane that comes between pre and post take-off scenes is of a 737. (00:03:50 - 00:04:50)
Continuity mistake: When Stacy tells her story in the first fury fighters' meeting, her hair changes several times between covering her medallion and not covering it. (00:11:50)
Continuity mistake: 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. (00:17:45)
Continuity mistake: 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. (00:37:40)
Continuity mistake: 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. (01:07:05)
Continuity mistake: 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.) (00:21:40)
Continuity mistake: 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. (00:21:40)
Continuity mistake: 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. (01:29:35)
Chosen answer: Yes, there is a deleted scene where Adam, and Jack visit her in the hospital. I'd also like to say that on the DVD, there is a section with all the deleted scenes from the movie, including the bizarre visit to his whacko mom.