- Development Hell: A film adaptation which was planned for a 2011 release but never surfaced. Frank Welker would have voiced Heathcliff.
- Follow the Leader: Hmm. A fat, lazy, cantankerous orange cat... Where would that same idea later show up... You don't suppose the insanely iconic Garfield would honestly fall under Follow the Leader, would you?
Heathcliff: I was in the funny papers five years before this lame knockoff!
- Brought up during the segment "Cat Court" on Robot Chicken, when he takes Garfield to court for ripping him off.
- The Other Darrin: Mel Blanc voiced Heathcliff in the 80s animated adaptations. Over 20 years after his death, a video game for the Nintendo Wii, Heathcliff: The Fast and the Furriest, had Bill Rogers providing his voice.
- Outlived Its Creator: Before George Gately died in 2001, he handed the strip over to his nephew, Peter Gallagher. Another one of his nephews, Michael Gallagher, has written for Archie Comics' Sonic the Hedgehog and MAD among others.
- The Wiki Rule: The Heathcliff Wiki.
Trivia / Heathcliff