Dana Delaney is the second "Desperate Housewives" actress to appear on Cheers. Marcia Cross played Susan Howe, Rebecca's Sister in an earlier episode.
Sam sold his Corvette to Susan's husband Kirby Metheny in S10/E1. As is clearly stated by Sam in season 10, episode 23 (at 13:32:00), his Corvette is a, " '64 ragtop, black interior, rally red, with knock-off hubs." Elsewhere in the series, the Corvette is a '67 model.