Like hidden Mickey's there seems to be some traces of horizons still lingering in Epcot. I haven't found them all yet but I heard there is like 5 clues. I always notice some things from Horizons like the music in the Innoventions music loop and The Horizons shaped flower bed is out in the open. Thats all I really noticed. Some say there are clues of Dream Finder but I cannot find them. I bet Dream Finder has some to but I have yet to find a clue.