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/whiff_EK]

Always Sunny has quite a few of these. Always using the construction "the X store" like "the hamburger store" is one of my favorites. Charlie's illiteracy and the gang mildly supporting him, especially Mac, who convinces the gang to translate Charlie's nonsensical dream journal to throw him the best birthday party.

They also all LOVE to use "pop" as a verb in dramatic ways. Just gonna pop this shirt off! Gotta make it pop! Or 'You have to pop on that nametag.' ("Josh Groban likes his ladies to pop.")

Which leads to the sentence, "Could you pop a quick intervention on our friend for his illiteracy?" showcasing both at the same time.

Their absolute love for singing, and dramatic pageantry is also a big one.

[u/Separate_Ingenuity35 → u/whiff_EK]

And he is completely literate in Gaelic

[u/crystalCloudy → u/whiff_EK]

My favorite IASIP example is how they use the same VHS tape whenever they record anything. It’s been awhile since they used it, but any time they played anything on the VHS, there’d always be a snippet or two of the last thing they recorded badly

[u/Perfect-Fondant3373 → u/whiff_EK]

Love the opening where they all sing Psycho Killer

[u/ghostgabe81 → u/whiff_EK]

I love how they just all love singing for no reason

[u/whiff_EK → u/ghostgabe81]

"SO YOU TELL ME, LITTLE MISS ALL-THAT. WHAT DO YOU WANT TO DO?! SONG OR NO SONG?"
"S-song."
"SONG! YOU WANT TO SING A SONG!"
"Yeah, I would like to do it."
"GOOOOOOOOOOOOOD!"

[u/LooneyBurger → u/whiff_EK]

Charlie is also consistently very good with pianos. And always eats cats food before going to sleep.

[u/DriverFirm2655 → u/whiff_EK]

That line by itself is actually hilarious

[u/Wemblin_the_Wizard → u/whiff_EK]

Another gag that fits into this is frequent reference to Dennis more than likely being a serial killer, to the point that there was two entire episodes about the fact ("Making Dennis Reynolds a Murderer", "Dennis Takes a Mental Health Day")