As Melissa Joan Hart never had time to attend school functions like a normal teenager, the cast and crew of the show held a personal graduation ceremony for her. She was given a diploma for 'Nickelodeon High School', named valedictorian of one and voted "most likely to have her own series".
Clarissa has posters of They Might Be Giants on her wall because they were Melissa Joan Hart's favorite band at the time.
According to the book Slimed: An Oral History of Nickelodeon's Golden Age, Mitchell Kriegman had a rule that the color purple was not allowed anywhere in the show: Clarissa's clothes, furniture, scenery, etc.; though by his own admission it was often sneaked into the show.
A spin-off series entitled "Clarissa Now" which would have depicted Clarissa Darling as a college student was conceived but never materialized.
In the book Slimed: An Oral History of Nickelodeon's Golden Age, Mitchell Kriegman explained the concept of Sam climbing in Clarissa's window removed the need for him to interact with Clarissa's parents downstairs and "was a way to get him in her bedroom and start interacting faster. And it was also a way to show that they had this real friendship that wasn't about anything sexual. They were friends, and I wanted to keep it pre-sexual."