Audio problem: When Dr. Buddy throws the CDs in the garbage, the sound effect is that of glass breaking, not plastic. (00:26:55)
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)
Other mistake: In the scene after Dave throws a calculator at a colleague there is a very weird 3-second establishing shot of his apartment building. In this short span shadows fall over the building twice, and it changes between fully lit and fully in the dark twice. In the end there is the silhouette of some equipment covering the lower third of the screen. (01:11:30)
Factual error: Near the end of the movie Dave is trying to get to the Yankee game before Buddy proposes to Linda. One of the shots before the game is of the grounds crew doing the YMCA. The grounds crew does the YMCA in the 7th inning. (01:23:45)
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)
Factual error: When the young Dave is being embarrassed, his underwear shows 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 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)
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. (01:07:10)
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)
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. (01:27:15)
Answer: It's really not uncommon for movies to remove bits and pieces when broadcast on TV. Movies aren't just cut for content, they're also cut for timing. (Ex. "Shanghai Knights" used to be absolutely butchered when shown on cable - there were entire scenes missing, which created glaring mistakes.) It's also not uncommon for TV versions or foreign releases to change or remove cultural references, or use alternate takes depending on the language used. Depending on where you live, it could very easily just be that the version you're seeing is one of these alternate versions that was then also trimmed down to fit a TV timeblock.
TedStixon