We've been singing along with The Flintstones teaser since early last summer. We know exactly how John Goodman looks in his animal skin. Now we're finally getting a glimpse of how the rest of the movie will look when it hits the screen on May 27. Turns out that Universal's recently released trailer is a page right out of TV history, with scenes adapted from the old cartoon series. Audiences are laughing in recognition as Goodman's Fred skis down the back of his dinosaur steam shovel yelling ''Yabba-dabba-doo!''; as he slams on his car brakes (which, of course, are his two feet); and as he gets himself locked out of his house and pounds on the door shouting ''Wiiiilllllllmmmmma!'' In addition to Elizabeth Perkins (Wilma), Rick Moranis (Barney), and Rosie O'Donnell (Betty), there are also Kyle MacLachlan, Halle Berry, Jonathan Winters, and Elizabeth Taylor-in prehistoric faux fur. Not to mention the rock group the B- 52's, here renamed the B.C. 52's. So what else can we expect to see of the town of Bedrock? We'll see in doo time.