Question: What did the trooper mean when he said, "Didn't you know this ain't Saturday"? It always makes me wonder.
Answer: I think the trooper makes this joke in reference to Evel Knievel, a popular performer of the day. His shows, which prominently featured motorcycle stunts (particularly jumping) usually occurred on the weekends (i.e. Saturday).
Question: When Brutus and Nero capture Penny trying to run away, Brutus holds her by the straps on her dress. but when returning to the riverboat, Brutus holds Penny upside by her underwear. If it were possible, how would Brutus have managed to turn Penny upside down like that without releasing her and letting her run off again?
Chosen answer: It could be she got loose again when they were heading back and Brutus grabbed her again but this time by her underwear.
Answer: The trooper on the motorcycle had just landed in the water. In older days, the typical day to take a bath, wash hair, etc. was Saturday. The trooper in the car (once he saw the motorcycle trooper was okay and wet) just made a joke about him taking a bath.
Zwn Annwn
It was a redneck joke, playing off the stereotype that hillbillies bathe once a week on Saturday or Sunday.