Corrected entry: Earlier in the series Slater said more than once that he was an only child. All the sudden he has a sister.
The Wicked Stepbrother (1) - S3-E13
Corrected entry: Kelly mentions something her brother did when he was 19, but in all other shows, Kelly makes it clear that she's the oldest of her siblings, and she's in high school.
Correction: It's never been stated in any episode that Kelly is the oldest in her family. Yes, some episodes featured younger brothers and at least one younger sister, and two younger brothers came up to her at her wedding in Las Vegas, but still doesn't prove she's the oldest- she said she had an older brother who was 19 at one point so she is most likely 2nd oldest or so.
Corrected entry: Lisa, Zack & Screech all talk to JB as if they have known her since she was little. However, they have only known Slater for approximately four years, so them knowing her from a little girl, as implied, wouldn't be possible.
Correction: JB is only featured in one episode. The fact the kids knew her already (even if up to four years) doesn't mean she was known since a little girl...just that they all previously met her at some point.
The New Girl - S4-E4
Corrected entry: When Zach gives the presentation for the electronic date book, the lockers seen out in the hallway are all light blue. When Tori and Zach walk out that same classroom, into the hall, all the lockers are now orange.
Correction: The lockers seen from the view inside of the classroom are from the other hallway by the bathrooms. They are in fact blue. However we never see the main hallway lockers that are in fact orange in that camera's view.
The Wicked Stepbrother (2) - S3-E14
Corrected entry: Jessie punches her stepbrother on the left side of his face, but he is shown later with a black on eye on the right side.
Correction: Jessie punched her brother with a right cross, which would hit him in the right eye. He even mentions watch out for her right cross later in the episode.
Corrected entry: If you watch the later seasons of the show, you'll see that Zack and his friends graduate TWICE; once with Kelly and once with Tori.
Correction: The "gang" only graduated once with Kelly and Jesse. Tori never graduated during Saved by the Bell.
Correction: Slater never said he was an only child in any episode. Only Zack and Screech have each confirmed they were an only child (Screech confirmed it in this episode). JB was just never mentioned before this episode. His mother was never seen in the whole series, but she still could have easily existed.