was Pam Anderson ever on the show as a guest or cameo?

Yes, Pamela guest starred as Charles' girlfriend, Chris, in the episode "Teacher's Pest." In this one, Walter enrolls in a history class taught by Charles.

Pamela can also be seen in the final episode of CIC as the camera pans the audience during the ending credits.

I noticed in the tv guide that today's episode is one where Charles takes a job as a teacher's aide. This isn't the episode with Pamela?

Nope. Today's episode was entitled "Blackboard Bungle," and Charles was a teacher's aid in Jamie's class, which was taught by the hilarious Jerry Van Dyke! Charles is actually a teacher in the episode where Pamela guest stars.

Scott Baio and Pamela were dating and engaged to be married so that would explain why she was in the studio audience of the last episode.

Tiffini-Amber Thiessen was also on this show. You all know her as either Valerie Malone or Kelly Kapowski. Charles got all the dames on his show.

In the episode where Charles has to guest teach as a teacher's aide, Mark Paul Gosselaar is one of the students in the class seated next to Jamie.

ANd did you catch the episode where Adam steals the scooter? The cop who brings him in is none other than Michael Dorn (Worf from Star Trek: The Next Generation!)

yes i do remember that zack morris was one of charles' students. remember when charles had to teach walter powell about the war. charles should have given him an f, since he always tried to get rid of him.