After all these years, I still can't make out a word from the song the plays over the end credits. Could it be because it's in a different language?

There are no lyrics. None. It's all just gibberish and nonsense words. Jim Ellis, who composed, arranged and sang the closing theme, writes on his website: "I had originally written the closer to be an instrumental, but on the day of recording I began joking around singing the melody that the saxophone would eventually play. Of course there were no lyrics and I was just sort of scatting gibberish. Well, Hugh [Wilson] and Tom [Wells] thought that was funny and that it made a joke about the general unintelligibility of rock lyrics. "