Visible crew/equipment: When Albert and his friends are in front of Doris' house they are singing a song about going to the park. As they are finishing the song and leaving to go to the park, you can see the reflection of the microphone in the window of Doris' house.

Continuity: Old Weird Harold's pants fall down twice in the film. His boxers are different colors each time; once they're red, the other time they're blue. The director admits to this mistake in the commentary.

Plot hole: In the movie the kids know who the Cosby Kids are and the parents do not, yet it should be viceversa since the adults would be the generation who watched the show as children.

Continuity: At the track meet, Laurie runs the third leg of the 4x100 and hands off to Doris to run the anchor leg. At the finish line, Laurie is there to cheer on Doris as she crosses line first. Only the first and second runners of this relay would have time to make it to the finish line in time to see the end of the race.

Continuity: In the scene when Doris is watching The Fat Albert Show, she is holding the remote out just above her knee. When her tear falls down, it falls directly in the middle of the remote.

Continuity: When Bill Cosby (appearing as himself) opens his door to find Fat Albert there, Fat Albert puts his hand out to shake Cosby's. In the next shot, he puts his hand out again.

Continuity: In the live action shots, Fat Albert always has a belt. In almost all of the cartoon shots, he doesn't have a belt, though he does in a few cartoon shots. The director admits to this mistake in the commentary, though he apparently only noticed it in one shot.

Factual error: When Fat Albert and Reggie are racing around the school track, there are palm trees visible over Fat Albert's right shoulder in the background. The problem with that is the movie supposedly takes place in Philadelphia, PA.

Deliberate "mistake": Fading is mentioned throughout the film. However, according to the director in the commentary, they don't really start to fade until the third time it's mentioned.

Other: In the scene when Fat Albert and the Cosby kids are in the classroom with Doris, it shows two girls at their desk laughing at Fat Albert. The girls have keyboards, but no monitors.