Just wanted to note that the reason I didn't post this thread in the "review" thread is because it's meant to moreso be a catalogue of everything that's been changed rather then my opinion/review.
Sorry if it ended up being one too many threads
Anywho..
The Araucan Bird is in the first screen with Donald where he's wearing the sombreros and taking pictures. At one point Donald almost loses all the hats, and as the tower of sombreros tilts precariously, the Araucan Bird can be seen swinging around the brim of one of the sombreros before returning to his hiding spot behind the tower.
I don't know if it's been mentioned yet, but the two screens that are the "same" from El Rio are the cliff divers (though it's new footage) and the speed boat with parasail. Donald is added to each of those in a comedic manner, but the general content of the screen is the same as before.
The "small world" kids are playing the 3 Cabs song, as noted from the way the instrument players are in synch with the music. So, the entire scene was probably reprogrammed.
Out in the ruins near the restaurant, you can see fire with mist/smoke next to the temple coming from a camp/hut. I never noticed that on El Rio, it may have existed but certainly didn't work. As noted before, music gently plays as you coast through that area too. I can't tell which song it is, but that i can hear the music (and various animal sound FX too, oh, and distant thunder crackling of fire) is a big improvement over El Rio which was just the noise of the restaurant.