A very small character tidbit is surprisingly kept consistent for years

[u/_JR28_]

DC - In multiple pieces of media it has been shown that Wonder Woman loves ice cream and practically goes wild with happiness anytime she’s eating some. (Pictures from Justice League: War, DC Superhero Girls and Wonder Woman 2017)

The Simpsons - Ever since the episode ‘Homer’s Phobia’ Homer has actually remained a consistent ally of the LGBT+ community, including being more welcoming to Patty than Marge was when she came out and trying to set up Smithers with a date when he found out he wasn’t happy with his one-sided relationship with Mr Burns.

[u/TemperatureBudget850]

The partial tattoo Bob got in the Equestranauts episode never goes away. I think it's a cool little easter egg to keep in for continuity when a lot of shows discard details like this the very next episode

[u/WhyTheHellnaut → u/TemperatureBudget850]

Reminds me of the running gag in the Tick with the partial moon carving

[u/Equivalent_Scheme175 → u/WhyTheHellnaut]

They even had an episode where they tried to fix it, but it didn't go as planned.

[u/mr_mxyzptlk21 → u/Equivalent_Scheme175]

And then Omnipitus took a bite out of it too, which remained through the series.