Dealer just did a transaxle fluid change and used T-IV not WS

Just did the first major service (dealer calls it a 30k service) on my O6 at 98k miles. As I was looking over the receipt and the list of parts used I noticed that they used T-IV instead of WS. When I told them about it, my service advisor claimed that T-IV is the correct fluid for the Prius. I have a screenshot of the repair manual stating that WS is the correct fluid to take in to the dealer and get them to change to the correct fluid. Having T-IV in the car for 500-1k miles before I have a chance to go back to the dealer won't cause any problems will it?

Also I initially went to the dealer just expecting to do an oil change and say no to all the other items they always try to sell me on, then I thought it's almost 100k miles and I should probably do some of the things he's recommending such as transaxle fluid and spark plugs so I went for the 30k service special and used a coupon from a crosstown dealer to get it for $290. When looking at the parts list I realized that they hadn't done the plugs either, which were included on the crosstown dealer's list of items on the 30k service but may not be on my dealer's list. I know the irridium plugs don't really need to be changed until 120k but should I try to get them to do it? Service was done at Toyota Central, Downtown Los Angeles.
Thanks