LOL. I just realized that I didn't do anything from last week's lesson about staying in the mount.

I also meant to try the diagonal stabilization in mount, where you grab the opponent's arm between his shoulder and elbow, then grab around his knee/thigh area on the opposite side. Pulling up on both will help to limit the opponent's ability to roll you. So I've heard, anyway.
"In case you ever wondered what it's like to be knocked out, it's like waking up from a nightmare only to discover it wasn't a dream." -Forrest Griffin