I saw a a show the other day (I will mention it momentarily) where the opening was clearly taped and recycled, as the set looked slightly different in the live shot.
Card Sharks and Trebek's Double Dare used nearly the same format for their openings, with the former using tape from the pilot.
What other shows did similar pre-taped openings of a slightly different set?
BTW, the show I just saw was the first Bonusround.ca listed episode of Pitfall: This particular episode had a flashing $2,500 sign as the top prize at the end of the bridge, but if you look closely the pre-taped opening showing the entire bridge, the flashing dollar amount clearly shows a flashing $5,000 sign.