When Beaver goes inside to ask about riding in the garbage truck, you hear the horn of the garbage truck signalling Beaver to come. But when Beaver runs outside, Mr. Fletcher is standing behind the garbage truck holding a garbage can. He couldn't have honked the horn.
Beaver: When I was little, I wanted to be a policeman, but I don't wanna be one anymore.
Larry: How come Beaver?
Beaver: Well I don't think I'd like ladies yelling at me all the time.