Despite the spate of minor annoyances described in last week's column, the organizers of the Night of More Than a Dozen Stars--the comedy benefit for the Committee for an Effective Congress, which featured the likes of Robin Williams, Chevy Chase and Buck Henry--came out of the evening with a respectable paycheck and the conviction that while comedians can be occasional pains, they're also pretty good at raising money. The sellout benefit itself netted $20,000, with lots more to come from a cable sale that should put the show on home TV screens sometime before this year's elections (strictly as an evening of entertainment, and presumably without the show's one political speech). And look for an East Coast version of the event to materialize before too long; the organization has been talking to former "Saturday Night Live" producer Lorne Michaels about working on that. Meanwhile, opinion is divided on how well the show's unquestioned star, Robin Williams, comes across in his first post-"Popeye" film, "The World According to Garp." "I think Williams is probably the worst thing in the movie," says one advance viewer. "But apart from that, it's pretty entertaining."