In the second entry in the alphabetic index, on page 255, it appears:

# symbol, function literals,
69, 121

On page 121 there is no reference to function literals. What there is really is a reference to a regular expression literal:

(def re #"Pride and Prejudice.*")

I suggest you add individual entries for each specific use of #.

For example, in the fourth entry, about %, only the post conditions are mentioned, but I think the index should contain a reference to % as part of the parameters of a lambda (%1, %2, …, %11, …), or as an alias of %1 in a lambda. (page 70).