I heard "swans" and "swimmin". I don't know exactly when they suddenly decided to get tight on pronounciation, but it's more strict under Sajak than under Woolery.
I remember one bonus round where the puzzle was MILAN ITALY, and the contestant pronounced Milan "MY-lun" and was ruled incorrect. On the other hand, back in the Woolery days, "Green-witch Village" was accepted for GREENWICH VILLAGE. (In fact, the host reminding the players to solve the puzzle "exactly as it appears" started the day after somebody said "Tweedledee and Tweedledum" for TWEEDLEDUM AND TWEEDLEDEE and got credit for it.)
Another one from the Sajak days (although it's a legitimate call): being called wrong for saying "The Atlanta Falcons" for ATLANTA FALCONS.