That reference is in the original printing. When I first ran the adventure, which was probably in 19821980, I had Verus send them to room 2-24 to assist Hargrove. It doesn't make a lot of sense, but he is crazy.
I suspect, but cannot prove, that the reference is meant to be to a list of quests that was cut from the module, and the reference wasn't cleaned up in copy-editing. Judges Guild didn't have terribly high standards in 1980.