Going through the tutorial i notice an error at the bottom of page 17 in the .pdf manual:
(make-instance 'gorilla :name "Lucy" :description :aggressive) (make-instance 'gorilla :name "Robert" :description :playful) (make-instance 'gorilla :name "John" :description :aggressive))) ;;;< 2x extra parens
The error does not appear on line 147 of the tutorial @ http://bknr.net/trac/browser/trunk/bknr/datastore/src/indices/tutorial.lisp