On the other hand, I did the exact opposite. I looked in the back, saw that it only listed new spells, and told myself: "Gee, that seems stupid. They must be listed somewhere else."
Took all of 2 minutes of reading to find what I needed.
Check the beguiler's spell list on page 11. The header is all caps and larger font. The one on page 24 for the duskblade is not in caps and thus looks as if it's part of the encounter.