The power seat issue is likely due to worn/corroded contacts in the seat switch - it can be disassembled and the contacts cleaned if you go slow and you're careful not to lose any of the springs and parts inside it. It' also possible that there might be a foreign object in the seat track preventing it from going back...

The window most likely needs a new window regulator, but the motor could also be the culprit. If the motor makes noise when you operate the switch then it's probably just the regulator.

When changing the transmission fluid, make sure to use Diamond SP fluid - Hyundai uses it as well as Mitsubishi so you can sometimes find that cheaper. Using the proper fluid is expensive, but will keep your transmission happy - I've got 264K miles on my original transmission and it's never had anything more done to it than changing the fluid and filter screen - I consider the cost of the fluid to be far less than the cost of transmission repairs.