Dad was acting strangely towards the end of the Watson’s drive. What evidence from the text lets us know that?

It seems to be stuck, playing the same line from "Yakety Yak" over and over. Since the record player is broken, Daniel has started listening to "hillbilly music" on the radio. Daniel jokes that he has decided to change all of their names to country names once they return to Flint: Kenny will be Homer.