In the Episode where Screech's parents are hugh Elvis fans and go on vacation on their wedding anniversery. The show Screech's mother, and some real short nerd was dating Violet Ann Bickerstaff. When the guys Zack, Slater, and Screech were at Screech's house and they start dancing and singing to Bobberann by the Beach Boys, when Zack turn comes he looks over and says the girls they all stop singing. How did the Girls get into Screech's house without the guys knowing?

In TV LAND, they got in through the side door of the house, that goes into the kitchen.

... in the topic of bloopers...

I was watching an episode the other day (I think it was "Class Rings") and I noticed that Zack's jeans were ripped. LOL. It was in that scene where he was sitting on the trash can by the stairs.