Regarding cards included in multiple copies in Cube Draft Some cards are included in multiple copies in the Planner Cube, but there is no way to verify this on the card pool review screen; I would like to see this improved.
I was able to figure out the situation with the Zendikar version because the description screen noted the inclusion of three fetch lands, but I didn't realize there were multiple copies of Risen Reef until the draft period had already ended, causing me to miss the chance to build an Elemental deck.
I also learned from the community that the Innistrad version includes three copies of Spider Spawning, but since I don't know which other cards are included in multiples, I haven't been able to play it.