Continuity: When the female owner of Beethoven's girlfriend (Virginia or something like that) tells her boyfriend (Floyd) to put the leash on the dog, he goes to do so but when you see his hand clip the leash on, the shot changes to a woman's hand clipping the leash on (the nails are covered in nail polish).
Great sites
Mistakes
At the beginning of the film when they all get into the 2 cars. Beethoven looks out of the window, the camera cuts to a back view of the dog then to the front again. Now he has a tennis ball in his mouth that wasn't there before. See more...
Beethoven's 2nd mistakes
Continuity: At the carnival, when the boy is standing in line for tickets, the girl he likes has her hair hanging straight. In the next shot, it's tied back in a ponytail.
Continuity: At the beginning of the film when they all get into the 2 cars. Beethoven looks out of the window, the camera cuts to a back view of the dog then to the front again. Now he has a tennis ball in his mouth that wasn't there before.