With the pricing games I mentioned, there's also Shower Game at 10 playings.
Found a lot more short-lived wrinkles from Wheel too:
* Big Money wedge: for the first taping only, any amounts on it (it randomized among $5,000, $7,500, $25,000, Lose a Turn and Bankrupt) couldn't be spent on vowels, but for some reason, they could for the rest of the season. Odd decision to make, IMO.
* Similarly, I've heard mentions that the $10,000 wedge was flipped over and used as a cash space for one week. (Someone else also mentioned an episode where it was placed upside-down by mistake, and a contestant hit it.)
* Hourlong Wheel. Six weeks and it was done.
* Apparently, very early on, there wasn't a gift certificate option in the shopping rounds; if it wasn't enough to buy another prize, or if you wanted to stop shopping, it was "on account" or nothing.
* Buy a Vowel, of course.