Plot errors

Are there any plot errors in the show that you can remember?

By the way, I'm not talking about those little errors like: "In one shot her glass is in the right hand, in the next it's in her left." Those are pretty boring since all shows and movies have them.
I mean the actual errors in the story, avoidable discrepancies.

Let me list some:

In the season 1 episode where they weren't allowed to watch TV, Clarissa had ordered a giant remote control. She said that with it, she can control the TV channels in the Kennedy Space Center 30 miles away. This implies the show is set in Florida, where it was also produced.
But in the first episode in season 2, she says her pet alligator grew too big and she had to send him back to Florida. Other scenes imply that the show is set in Illinois.

Her school is named the Thomas Tupper High. But in the first season (the episode where she talks to the camera like a news reporter) there is a picture that says Theodore Tupper High.

If Ferguson's rubberball doesn't fit through the front door, how did he manage to put it through his own door and through the door that leads to the stairs?

When Clarissa babysits Elsie Soaperstein, she talks about the previous three years when she had to babysit her and we see flashbacks of it. The episode plays in 1993, yet the flashback from two years ago doesn't show her room as it looked in 1991, but it uses the current set.
(Understandable from a production viewpoint, but in-universe, it's still an error.)

And what's the justification for the house layout change anyway? Clarissa's own room may still be kind of possible to be renovated that way in real life. But the living room? They moved the whole front door! And not only is there a new house in the distance of Clarissa's window, but they obviously cut down the tree and planted a completely different tree.