- Adaptation Displacement: More people are familiar with the DiC cartoon than the comic strip or Ruby-Spears series.
- Bile Fascination/Guilty Pleasure: For /co/ to the point where Heathcliff threads are a regular occurrence on there.
- Epileptic Trees: Heathcliff is written by Jon Arbuckle and is based on his observations of his cat, Garfield.
- Fandom Rivalry: With Garfield, to the point where Robot Chicken even acknowledged the similarities between the two cats.
- Memetic Mutation:
- Only the Creator Does It Right: Some fans of the strip feel that it declined after Peter Gallagher took over.
- We're Still Relevant, Dammit!: The aforementioned Facebook was mentioned in a 2013 strip.
- What Do You Mean, It Wasn't Made on Drugs?: This is a very bizarre comic strip.
YMMV / Heathcliff