The Geroge makes me laugh: if Hemingway drank in every London pub that claims him as a one-time custodian, he'd never have got a day's work done in his life. Same with Dickens. I live up in West London where one pub nearby (The Dove) claims to be the place where "Rule Britannia!" was written (no, it wasn't), and the whole city is full of this jovial nonsense that tourists love.
The George that takes it to a new level by optimistically suggesting Shakespeare would have been a customer.
Cracks me up every time I'm there.
The only one that comes close to it is the Still & Star in "Blood Alley". Threatened with closure the landlord was on BBC London a few months back and he suggested that because it was in the old butchery quarter (it sits on the corner of a street nicknamed "Bloody Alley"), and it was _obvious_ that Jack the Ripper was a butcher, then clearly his pub was Old Jack's regular local.