In the movie Coherence, when Halleys comet passes near to Earth...
the person who tries to cross the dark zone will end up in a random dimension (or parallel universe). Chances of returning to one's own dimension are slim to none as the probabilities are one in millions.
We, the audience still don't know whether the above is just an assumption or the fact about the cosmic anomaly.
I'm just confused about when the anomaly actually started to occur. Did it happen even before Em (the lead character) reached the party?
If that is a yes, does it mean everyone except Lee, Beth and Mike were from different dimensions?