I feel like it was trying to be interesting but ultimately ended up not making much sense. The comet at the dinner party makes a dark zone outside that makes an unlimited number of realities collide so if anyone leaves another version comes back without anyone knowing. Say this is true, no actions would be any different anyways because they are the exact same person with the exact same thoughts, so all of this with different items in the box or behavioral differences or even different numbered dice would all still be exactly the same, and don't even get me started on duplicates overlapping and being additional of the same people in the same house which they did at the end but not throughout the movie.
It tries to apply Schrödinger's Cat to this dinner party but at least in my opinion the outcome has always been decided and not knowing the outcome doesn't change anything as if human perception could change reality, if a tree falls but nobody can hear it does it make noise... yes even though nobody heard it. There can be possible outcomes in the future but never in the present or past, sure before I open this box I won't know the cat is dead or alive but it already is one of the two before I open it, nothing changes, not knowing which outcome will happen doesn't mean both could, that cat was always going to die or if it lived it was always going to live. I don't understand how possible different outcomes can occur if other versions of their exact same duplicates never made those decisions, its just a discontinuity paradox. But if you accept that for no reason they are making different decisions in different "identical" realities then you'll probably enjoy it, it just doesn't make any sense to me.