hey i have a question too asked anybody if Pratt and McClain did the openning theme for season 3 and so on how come there names where not in the closing credits did they also do the closing theme for happy days season 1 an 2

I'm not sure, check the imdb or Happy Days Online

I think what happened was they (Pratt & McLain) did a "Cover" of the "Happy Days Theme" that came out as a single in 1976. They didn't actually sing the version that was on the TV show.

Jimmy Haas (lead vocal), Ron Hicklin, Stan Farber, Jerry Whitman and Gary Garrett (backing vocals) -- plus backing musicians.