Continuity mistake: At the beginning of the bowling alley scene, Uncle Buck rolls a ball in unison with a man on the next lane. The ball knocks over all the pins, but when they cut back to Buck celebrating his strike, the man next to him is rolling another ball already, much faster than possible.

Uncle Buck (1989)
Ending / spoiler
Directed by: John Hughes
Starring: Gaby Hoffmann, Jean Louisa Kelly, John Candy, Macaulay Culkin
Uncle buck (John Candy) makes friends with Tia and Maisy and Miles, wins back his girl friend Chanice Kobolowski (Amy Madigan) and ends up driving away waving happily while his girl friend sets off in hot persuit.
Calum Brown
Buck: What time do you want me to pick you up after school?
Tia: Don't bother! I'll get a ride with friends.
Buck: No, I have my orders. What time?
Tia: Are you really this stupid? I said I would get a ride. I always get a ride.
Buck: Hey, I'll just call the school, find out what time, and meet you right here.
Tia: Go ahead, call the school. I won't be here.
Buck: Stand me up today, and tomorrow I'll drive you to school in my robe and pajamas and WALK you to your first class. 4:00 okay?
Trivia: In the scene in Maizy's class near the beginning of the film, the little girl with long blonde hair sitting at the desk next to Maizy is a young Anna Chlumsky, who went on to be the star of 'My Girl' and 'My Girl 2'.
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Answer: You can't actually see a person, all you see is a human-sized lump under the covers. It's possible that it's just bunched-up blankets, some pillows, or even clothes.