Keep Circulating the Tapes: Season one got a DVD release and is even popular enough that 7 episodes of it are on PlayStation Network. The other 4 seasons? Not so much. Subverted recently for Seasons 2,3 and 4. The first four seasons are now available to stream on Hulu. Played straight with most of season 5, as only the first three episodes are on Hulu.
Unintentional Period Piece: Good God. The intro alone could easily date the series to the 90s and that isn't even getting into the the characters clothes, the style of the house, and Clarissa's old 90-something era computer.
In 1995, a spin-off called Clarissa Now was pitched to CBS. It would have shown Clarissa as a college student in New York, working as an intern for a newspaper.
Interestingly, that was almost the exact same career path that Melissa Joan Hart's next character, Sabrina, did follow after high school. This has led to more than a few people joking that they didn't know it was two separate shows, and just assumed that Clarissa woke up and discovered she was a witch.