Questions (you don't have to know physics to answer).
1) When the cube is about to implode, all the numbers carved on the walls appear in the same room, and so does the body of the guy who hanged himself. But what about the other corpses? And the people from all the other realities?
2) After KATE stabs SIMON in the eye, his future version appears. I don't know how far ahead from the future he came, but regardless, how was he still alive without any food or water (he even says that he's hungry)?
3) SIMON collected the watches from a bunch of versions of JERRY. They all show the same time. Is that possible?
4) Why were MAX and JULIA's corpses still together (they couldn't die in the middle of sex)? And why were they floating?