I was watching S4E2 of Shakespeare & Hathaway the other day and the plot involved something that I'd never heard of (see spoiler, below) until it featured as the major plot element of an episode of the Brokenwood Mysteries.
The plots of Brokenwood and S&H both referred to a tontine - a group financial instrument. In Brokenwood the whole case hinged on the tontine, in S&H it appeared to, but in the end didn't.
When one of the characters described the nature of this thing to another character, it was assumed (and stated) that the character in question was looking at his 'phone (held just out of view) and reading a description he's looked up on-line. This made me think it would have been quite amusing for the character to deny looking it up and say he'd got his information from an episode of Brokenwood. This led me to wonder: has any TV show ever directly named, as a plot point, another, completely unrelated TV show?
I know there are crossover shows that reference each other as though they were part of the same real-life universe (Warehouse 13 and Eureka, for example), but I was looking for a TV show that made reference to another show as a TV show, like a character in, say, Holby City (medical soap/procedural) saving a life and saying "I learnt how to do that from an episode of Casualty".
If it just doesn't happen, is there an established reason? Something like trademark infringement or something?