Why would all these parallel worlds have a similar dinner party, if each character in each world will have slightly different (or not so slightly) life paths? Surely the likelihood of having such a dinner party on such a day, is highly dependent on a life long chain of specific events?
The answer is yes. BUT there are infinite worlds and only those worlds that by chance had gathered a dinner party would mass-hysterically produce behavior like those we witness forcing cross worlds activity.
In countless of other worlds we would just have the house owners sitting and sipping wine in darkness waiting for the power to come back. In other words, given infinity we are bound to see those and only those worlds in which they gather and raffle each other up like they did here..... and beside, we only see a handful of even those worlds.
PS: The mixing starts when the phone brakes in the very beginning in the car. The team we meat are all from different worlds from the very get go (or most of them). Evident in not remembering or misremembering each others backgrounds, as we learn through their small talks - like if the Buffy guy ever acted in Roswell or not.
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