The one 'exclusive' thing I really liked about the artwork of the Dragon Chef was that patched-up furnace he had in his heart. The patch itself was a reference to how machines were destroyed in R2, but the machine itself looked like it came out of that kind of style too. I remember seeing fencework in Rayman Origins in the levels of Mystical Pique that were almost identical to the ones seen in for example the Sanctuary of Stone and Fire, when you find that Robo-Pirate on the bridge over the lava river. That kind of drawing makes me think that they either still have some of the art designers that were present during R2's development, or they've paid some kind of hommage to it, which is a nice gesture, I think.