Dr. Rydell makes a mockery of the Buddha, asking how can a man weighing 600 pounds teach people about self-discipline. While some statues depict the Buddha as a fat man, many other statues depict him with an average build. In fact, the Buddha spent much of his journey towards enlightenment as a beggar, practically starving. Some statues depict him looking very bony in remembrance of this time in his life.
Adam Sandler's sideburns change lengths throughout the film, particularly when he is first boarding the airplane. When he is saying goodbye to Linda, they are longer, and then they become shorter when he is on the plane.
When David is in the car with the prostitute, he starts recording the encounter after she sings "I feel like dancing!" However, when David is talking to his lawyer, the recorder replays the singing, which was not recorded.
In Yankee Stadium, when Dave attempts to run out and take over the P.A. microphone, the mic shown on the stand is a popular news mike - an Electro-Voice 635 - a wired mike, with no cord plugged into it. However, when he actually gets out there, and takes the mike off the stand, it's a Samson wireless mike, with the little antenna sticking out the back.
In the scene where Dave Buznick is preparing breakfast for Buddy Rydell, there is a difference between the eggs that Dave Buznick cracks into the frying pan and the eggs that are served to Buddy Rydell. When Dave Buznick cracks the egg on the edge of the pan, he also broke the membrane of the yolk causing the egg yolk to run. The egg that Dave Buznick serves to Buddy Rydell does not have a broken yolk.
When Dr. Rydell and Dave leave the monastery, you can clearly see two passenger vehicles and a patrol car in the background with its lights on controlling traffic as they drive down the road. In the next shot, the trailing vehicles and the patrol car have vanished.
At the airport before Dave kisses Linda, he looks over and sees Buddy sitting on the bench. But after Dave boards the plane - obviously before Buddy - Buddy is already seated waving Dave to sit next to him.
In the scene where Dave, is on his balcony of his apartment speaking on the phone, there is a boat passing in the background. The wake from the boat disappears when it goes under the bridge, but re-appears when it is on the other side.
When Dave is frying eggs. he cracks the egg on the edge of the pan. A large chunk of the brown shell falls into the pan with the eggs. Dave doesn't remove the shell, yet when he serves the eggs they have no shells in them. This shell is very large, sticking up at least 1/4 inch above the surface of the frying eggs. The heat of the frying pan is so high that the shell couldn't possibly be removed before part of the egg had cooked.
After the Yankee game at the end of the film Dave and Linda can be seen waiting for the 4 train. They are actually shown standing on the wrong platform, likely so the shot would show Yankee stadium in the background. The train they are waiting for takes them geographically away from the setting of the film, heading into the Bronx before reaching a terminal several miles north away from the city.