These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: The Quest for Karla
Ho Yay: The letter that Bill Haydon wrote about Jim Prideaux to his Circus talent-spotter.
In the second book, Luke and Jerry have such a close relationship that they're Mistaken for Gay.
It Was His Sled: It's quite difficult, especially if you read any later Le Carré novels first, not to know the identity of the Mole in Tinker, Tailor.... However, it doesn't really matter as the identity of the Mole is not really a twist and the real meat of the story is Smiley's investigation and how the Mole was being used.
The Scrappy: It's very hard to find a fan who likes Ann Smiley.