Where Every Bloke Knows Your Name - S5-E10
Question: Before Frasier and Daphne go to the pub for the first time, the text says "So authentic, there isn't an ice cube in the joint." What does that mean?
Answer: It's a joke that relies on the stereotype that British people drink warm beer (i.e., the pub is so authentically British, they don't have any means to cool a drink). In reality, this isn't the case; lagers and most beers are refrigerated, while cask ales (a.k.a. "real ales") are served at "cellar temperature", which is usually colder than room temperature but not as cold as being in the fridge. For Americans used to "chilled" or "ice cold" beers, this comes across as warm and gave rise to the idea that Britons drink warm/tepid/room temperature beer...whence the joke.
Frasier Gotta Have It - S5-E19
Question: What does Martin mean when he says Caitlin is a flake?
Answer: When Frasier and Lilith got married, Lilith became Niles' sister-in-law. Even though they're divorced and she's now his ex-sister-in-law, it was just a joke about the stereotype that in Arkansas, brothers and sisters sleep together. One could also interpret it as in Arkansas, guys sleep with their brother's ex-wives, but that's not a stereotype associated with the South.
Bishop73