Uncle Buck (1989)

Continuity mistake: The scene where the elementary school teacher asks his kid what they did that week. After he asks that question and Maizy raises her hand, look at the desk belonging to the girl in the row next to Maizy. It has crayons and other supplies on it. After the teacher calls Maizy's name, the shot goes back to her, showing the girl in the next row's desk completely empty. (00:58:00)

Miles: Where do you live?
Buck: In the city.
Miles: You have a house?
Buck: Apartment.
Miles: Own or rent?
Buck: Rent.
Miles: What do you do for a living?
Buck: Lots of things.
Miles: Where's your office?
Buck: I don't have one.
Miles: How come?
Buck: I don't need one.
Miles: Where's your wife?
Buck: Don't have one.
Miles: How come?
Buck: It's a long story.
Miles: You have kids?
Buck: No I don't.
Miles: How come?
Buck: It's an even longer story.
Miles: Are you my Dad's brother?
Buck: What's your record for consecutive questions asked?
Miles: 38.
Buck: I'm your Dad's brother all right.
Miles: You have much more hair in your nose than my Dad.
Buck: How nice of you to notice.
Miles: I'm a kid - that's my job.

Trivia: The scene where Macaulay Culkin was waiting at the door for the babysitter and imagined the three burglars was the scene that inspired the box-office hit, Home Alone. (01:16:10)

Question: In the scene where Buck's brother rings him up to babysit there is a body in Buck's bed. In the scene before Buck is at a bar but brings no one home from the bar, so where did the the extra person come from?