I've been a fan of derren for a while now. All the books that I have seen of his, pretty much just talk about his life and such, nothing of his that I have read talk about doing the stuff that he does (which is amazing!)....
You clearly didn't read past the first couple chapters of his books.
In Pure Effect, Derren Brown explains in exhaustive detail how he does his Smoke effect, which he performed for Stephen Fry on TV....along with many other effects he's done.
In Trick of the Mind, he explains cold-reading possibly better than I've ever seen it explained anywhere else.
In Absolute Magic, he explains how he used to levitate a lady's finger ring....and also describes many more subtleties (when magicians or mentalists use the word "subtlety," it basically means a convincer, a small thing that adds a sense of reality to the illusion, which isn't necessary...it's not the fundamental secret of the trick, but if you add 2 or 3 subtleties to an effect, it makes it WAY better/more memorable/feel more real.
In tradecraft (for spies), they call it "window dressing."
Instead of the spy just sitting on a park bench looking around,
he holds a newspaper and does a crossword puzzle or something.
I'm trying to think of an analogous "subtlety" in game.
Probably a good analogy would be:
instead of just delivering a spoken FTC,
adding body-rocking or opening over your shoulder to the FTC.
You can still deliver an FTC without those added subtleties
There are also tons of verbal subtleties.
For example, in storytelling, you could tell the same story in 2 ways:
1. I said to him, "Dude! Your car's on fire! And he just flipped me off and drove away."
2. I said to him, "Dude! Your car's on fire! He looked at me... He heard me... And then he flipped me off (gesture to girl) and drove off in his burning car."
The 2nd story has the verbal window dressing.