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: I couldn't understand the joke in the beginning ("In such small portions"). Can someone explain it to me, please.
Answer: Woody says "There's an old joke - um... two elderly women are at a Catskill mountain resort, and one of 'em says, "Boy, the food at this place is really terrible." The other one says, "Yeah, I know; and such small portions." Well, that's essentially how I feel about life - full of loneliness, and misery, and suffering, and unhappiness, and it's all over much too quickly." The 2nd old lady is complaining about the small portions of terrible food, as if large portions of terrible food would be better.
Answer: It's a buffet.
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