The part when they get to El dorado and if you watch the horses mouth it says El do-ra-do when they do and in time XD that was the part I always looked forward to seeing and I did like the way the second main character to be introduced whatshisname was introduced it's been ages since i've seen the film lol.
Um not really they are all taking up about a third of the screen at the moment but you look at the humans the first time and don't see the horse moving its lips because you don't expect it to be i guess.