I enjoyed this film but one thing I can't quite sort out in my head... (again, SPOILERS TO FOLLOW!)
...how is it that when the time travelers destablize and reawaken back to the current day their conscious and memory goes with them? And what happens to the other conscious. I know they made maybe two passing attempts to explain it through black-hole-foolery, but I kept trying to imagine the uninterrupted experience of the timeline. Hmmm...I may have just figured out the answer to my own question. Anyway, what do you think was going on? Also, what other conceptual problems or limitations stood out to you?