In Friends S08E17 “The One With The Tea Leaves”, Ross’ T-Shirt has an image on it which means “Friends” in sign language.
In S16E09 of The Simpsons, Chief Wiggum gets promoted to the police commissioner. Lou is promoted to chief and starts wearing long sleeves to reflect his promotion.
When Ron Swanson (Parks & Recreation) gets a hernia, in the scene several hours after he tries to eat lunch shows his lunch container strewn across the floor because he could not get up to throw it away.
In Black Mirror's "Playtest" episode, there's a contract which says "If you have paused to read this, you will die unless you forward it onto five people within a 28 day period."
In Brooklyn 99 S01E02, “The Tagger”, you can see on the computer screen the start of a penis graffiti, which the guy was arrested for doing in the first place.
In the Office, instead of having the Irish flag on St. Patrick's day, Michael Scott has the Italian flag on his desk.
27Rick & Morty
In Rick & Morty S01E10, there is a picture of Abradolf Lincler on Rick's bedroom wall. He is introduced as one of Rick's creations in the next episode.
In Sherlock, when Sherlock goes to confront Moriarty at the swimming pool and is greeted by John, John is blinking SOS to Sherlock to signal to him that they are in danger.
In Silicon Valley, Gilfoil hacks a smart fridge and this code is displayed. In the code is the URL for the music video of Rick Astley’s “Never Gonna Give you up” on YouTube.
In the South Park episode “The Last Of The Meheecans”, Butters calls himself “Mantequilla” which is Spanish for butter.