When did the cosmic event first occur in Coherence?

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?

plot-explanation coherence

Best Answer

So, as you have hinted in the question - Em faces a phone shatter that is as she's pulling in. It is quite possible that she's already crossed over to another reality right her.

Here's some conversational elements that would support this theory:

Laurie & Kevin used to date, but he doesn't appear to have any recollection of her at all when she's being discussed before she arrives. Meaning, in the reality that Kevin is from, she may have been not as important a figure in his life as for some of the others.

Also, Mike says that he was the main character of Roswell. Laurie, who was apparently a huge fan, fails to recollect him being on the show. Again, this could be because the reality that Laurie is from Kevin wasn't on that show.

(Although this is not mentioned in the film, the actor who played Mike, Nicholas Brendon, was on a the TV show - Buffy The Vampire Slayer. So even for our reality, Mike made a different TV show :))