Starting with this episode Lisa's hair has changed from curly to straight. Her hair will be like this throughout the "Tori"-episodes.
Why does Lisa, who believes that Zack is her secret admirer, act as if this would be a big deal and that dating Zack would be something new? Only two episodes earlier do her and Zack kiss several times and tell Screech that they are going to date?
Response: It's possible that the reason for that is because in the episode where Zack and Lisa first kissed, it was a Jessie/Kelly episode, so the Tori episodes are probably a different continuity than the Jessie/Kelly episodes.
The gang also ran a teen line in season 2's 1-900-CRUSHED.
In the previous episode Lisa and Zack kissed and at the end after receiving Screech's blessing decide to start dating. However, in this episode there is no mention of any of this.
How does Melissa ever get to the tables at the Maxx? They never show any way that she could ever access the tables.
Lisa mentions going to F.I.T. The Fashion Institute of Technology is an actual institute located in New York.
When confronting Zack in the hall (and mistakenly mentioning the nonexistent "willow trees" on campus), Screech says to meet him outside at the oak trees at 3pm. But they actually end up meeting in the hall again.
At the end of the episode, after receiving Screech's blessing, Zack and Lisa decide to begin dating. The relationship between them apparently stopped immediately after this. The only time it's mentioned again is in the Saved by the Bell: The New Class episode "Fire at the Max(2)".
In the commercial, one of the participants quoted that they're "saved by the bell"; (s)he used the title of this TV show in the line.
Considering the size of Robin's check, it would almost certainly take some time for it to clear. Considering how quickly Betsy Crocker came down on Screech, Robin probably would have had time to put a stop payment on her check.
In a commercial that Slater performs in, he uses Mario as his name. The actor who plays Slater is Mario Lopez.
In the scene where Lisa asks Darren to the dance, he is wearing the same green sweater as Zack is wearing at Lisa's sweet sixteen party in "The Aftermath".
Lisa and Kelly are wearing the same dresses for dinner as they did in the second episode of the Palm Springs two-parter when everyone meets in the lobby for dates.
When Zack took off the janitor's uniform at the beach he was wearing a watch, but he wasn't wearing it when he sat down in a chair next to Slater and Kelly.
Factual Error: Screech said that 25 years ago on that Thursday, they cancelled Gilligan's Island, but 25 years from the day the show was cancelled (Monday, April 17th, 1967) was not a Thursday, but a Friday.
Zack's girlfriend in this episode is actually the episode producer's wife.
The band line-up; Zack; vocals/guitar, Kelly; lead vocals, Lisa; bass/vocals, Screech; keys & Slater; drums/vocals.
It's interesting that while the six regulars always seemed to do everything together, there are always only five of them in the Zack Attack band, with Jessie and Kelly apparently used interchangeably.
The man by the Madonna look a like is supposed to look like Michael Jackson. Lisa says, as she gives her speech, "I'd like to ask Michael to wait backstage for me."
When the students are having a meeting in school with Johnny Dakota the anti-drug commercial host, Jessie discusses her drug problem as being hooked on caffeine pills. She is referring to her story from the episode "Jessie's Song" in the previous season.