In the opening credits you see the family on the couch and Jennifer piles in. That doesn't seem to appear in an actual episode though.

The episode where they all pull Jennifer onto the couch is called "Batter Up" from the second. I'm 99% sure that's the episode. The other 1% of uncertainity comes from watching it the last time. I didn't see that clip while watching the episode. But that could be due to Nick-at-Nite's editing.

The other one with Mallory running to the kitchen,--I don't know. I know that I've seen the episode, but I can't remember what it is. What happens in the scene is this:
Elyse is standing behind the chair, while Mallory is in the other room. The phone rings and Mallory comes flying in announcing that she's gonna answer it.
But I can't remember that title...

I think the episode where Elyse spins around is the one where Alex coaches Jennifer's baseball team, and on the phone one of the girls has to bow out of the game. I think that scene is also from the batter up episode, but i'm not positive.