I noticed in the manual some of the callers from the original GTAIV game are gone... Matt Pearson, the winner of the WKKT radio station contest to be in GTAIV was removed in EFLC... at least his name isn't in the manual. Also look at some of the peds and other credits. Some were removed.
EDIT: Upon looking through all of the credits, I see they only listed the additional things in the manual, not original GTAIV... odd. But I guess the credits reel would be far too huge to put in print then.