The ending to "Oh, You Men" is one of the greatest Brick Jokes ever.
Lots of the commentary tracks are this. Especially when you realize half of everything they say is bullshit.note They do reveal some facts, but make up a lot of stuff as jokes Also, several of the commentary tracks feature one of the actors in character (sometimes as a character from the show, sometimes exclusive to the track).
"Horny Slut Hotline, this is Peppermint Speaking!"
(His boss, on the line): Hello? Petersen? Is that you?!
David yelling "This is Bullshit" and Flipping the Bird at the camera. Cross doesn't actually think it's funny, but "mildly amusing."