Author Avatar: The Grinch to Dr. Seuss, not only because he was also a recluse. Seuss lived up on a hill in California and, every Christmas, would look down with distain upon the houses covered in cheesy lights and decorations below him.
Channel Hop: Originally run on CBS for over 30 years, ABC got the special during the Turn of the Millennium and would often run it in double-features with the 2000 film. In 2015 the rights went to NBC, making it possibly the first Christmas special to have been on all of the original Big Three networks at some point or other.
Edited for Syndication: For many years US network broadcasts deleted one of the "You're a Mean One" verses ("You're a rotter, Mr. Grinch...") as well as a genuinely disturbing moment in which the Grinch does his Slasher Smile while leering at several young Whos in their bed.
Later ABC and (as of 2015) NBC broadcasts cut the special down to the bare minimum to make room for more ads, keeping the important story parts, deleting many of the Visual Gags, as well as a shot of the Grinch cracking his whip while Max pulls the sleigh up Mt. Crumpet. Averted with broadcasts on the Turner networks such as TBS and Cartoon Network, which show the special uncut, probably due to being cable networks that can make revenue off cable subscriptions in addition to ads.
According to Chuck Jones' daughter Linda, the original idea was to have Boris Karloff narrate, voice the Grinch, and perform the song "You're a Mean One, Mr. Grinch", that is until Karloff informed Jones he can't actually sing, thus paving the way for Thurl Ravenscroft. Stage productions, and the live-action film would keep the idea of the Grinch's actor singing it though.
For fans of Space Ghost Coast to Coast, it was disappointing that George Lowe didn't narrate the film and only narrated the video game. Imagine Space Ghost narrating The Grinch; admit it, that would've been awesome.