Deliberate mistake: When Jafar sees Aladdin reflected in Jasmine's crown, Aladdin is the only thing visible. This isn't possible- we should have also seen the background of the room, the objects around him, etc.

Aladdin (1992)
1 deliberate mistake - chronological order
Directed by: John Musker, Ron Clements
Starring: Robin Williams, Frank Welker, Gilbert Gottfried, Scott Weinger, Jonathan Freeman, Linda Larkin
Genres: Adventure, Animated, Disney, Family, Fantasy, Musical, Romance

Continuity mistake: The tiger bites the seat off the suitor's trousers, allowing the viewer to see his polka-heart boxers. When we see the tiger in the courtyard, he has a part of the same boxer shorts in his mouth. So if he bit off the seat of the trousers, shouldn't he have purple cloth in his mouth? (00:11:45)

Trivia: When Rajah transforms, if you watch it frame by frame, his head bears a striking resemblance to Mickey's head. There is a long-standing tradition for Disney to put 'hidden Mickeys' in their movies.
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Answer: Aladdin is referring to the person riding the horse as being a "horse's ass" in the way he is acting, thus the horse the person was riding on has two rear ends, his own and the rider.
Mark English