Man, who wouldn't feel like a chump after watching that?

Wet sanding will knock down the orange peel but a roller job usually leaves too thin and uneven a coat to save. You would sand through to primer in the low spots before the texture ever came out, and the finish still would not look right. Keep in mind the guy probably used a foam roller and a can of hardware store clear, which is not the same stuff a gun lays down. Best he can do is scuff it, spray a real coat over it, and call the roller job a learning experience.

Did your buddy's list at least mark which episodes are half canon and half filler? Those mixed ones are usually where the side characters get their moments, so you could just watch those and skip the pure filler stuff.