There's one that popped into my mind immediately, but unfortunately while from an anime, it's not animation:
SDF Macross ED (
Minmei version).
It's been a long time since I've watched it, but I think that there might be scenes like that in the last episode (and possibly one other episode) of Saikano.
I'm sure that there are at least a few shows where someone is looking through a magazine, book, or manga. Alas, these are usually quick incidental scenes since I assume that most animators don't want to draw entire pages of a book.