Continuity mistake: In the first two seasons, there are 3 bedrooms upstairs: Mama's, Fran's, and Sonja's. But after Buzz and Sonja move out and Aunt Fran dies, Bubba moves in and takes Aunt Fran's room. Vinton and Naomi are still in the basement complaining that they wanted Fran's room. However, originally there was another room upstairs, Sonja's room, that disappeared.
Continuity mistake: In the scene where Neville is telling Dennis he should find a woman, Dennis is getting dressed up in his suit to meet Dagmar. After Neville has finished talking, Dennis leaves the hut without a suitcase. But when he arrives at the hotel with Dagmar he is seen putting his case on the bed(Dagmar has one as well). It is clear that he has come straight from the hut, as he is telling Dagmar what Neville had told him before he left.
Other mistake: When Teela is at Snake Mountain, she overhears TrapJaw saying how Skeletor's electrical creature will control all of the machines at the palace. When Teela returns to He-Man, she says that the creature Skeletor created is called Byte. There's no way for Teela to know the name of the creature, since TrapJaw never referred to it by name. (00:14:24 - 00:15:20)