Oh, '90s comedy: you are so messed up.
"The Mamas and the Papas"
In this early episode, the gang pairs off and each couple is forced to get fake married as part of some "educational" activity meant to teach the kids about the responsibility of marriage. What — you guys didn't have Sophomore Couples' Counseling? What's wrong with your school?
When Jessie tells Mr. Belding she'll be going by "Mrs. Slater-Spano," he goes:
Part of the course involves role-playing "difficult" marital scenarios.
And you can see why this was a bad idea to begin with...
"Screech's Woman"
In an attempt to help Screech find love, Zack makes up a fake girl named "Bambi," and is later made to dress up as her.