There's a plastic lever that breaks on the rear door handle - not uncommon. You'll just need to replace your door handle assembly - it comes off with a couple of 10mm nuts once you have the inside trim panel and plastic vapor barrier out of the way.

Your seat issue needs some diagnosis before you waste any money just throwing parts at it - download the FSM wiring diagrams first (so you know which wires to be checking), then you'll first want to check to see if you have power at the seat switch. If you have power there then check to see if there's power getting to the motor. Your problem could be a broken or cut wire, a bad connection at a wiring connector, a bad seat switch, or a bad seat motor, but find the cause before you replace any parts.