Continuity mistake: Just after Otis makes the ghost sounds from inside the house, it shows the gang standing together outside the house. Otis is with them outside, which is impossible, as he is inside the house pretending to be the ghost.
Fat Albert and the Cosby Kids (1972)
1 continuity mistake in The Prankster - chronological order
Starring: Bill Cosby, Lou Scheimer, Erika Scheimer, Gerald Edwards
Plot hole: Dumb Donald chooses not to play hookey with the rest of the gang. He instead goes to school. The gang is even worried Dumb Donald may, "Rat them out" to the school. Yet throughout the episode, Dumb Donald appears/disappears with the gang as they are skipping school.