M*A*S*H used to be shown, in the States, with a laughter track. They may have taken if off for later reruns. The BBC always showed it without the laugh track, which was why Larry Gelbart preferred to live in Britain for many years.
Yeah, did the quiz change since you left this comment? Because I don't think any of the current answers were even acting (or, in many cases born) when Gilligan's Island was on the air.
Bob Saget can be a bit confusing, since he's also the narrator of How I Met Your Mother... Or do you only consider on-screen stars? Maybe go with John Stamos, or the Olsen twins, or the now infamous Lori Loughlin instead?