It's really only interesting when every verse is completely unique and different. Like ff14.
The world doesn't split in two. A layman would conclude that the universe is just constantly branching into an exponentially growing tree of all imaginable possibilites, with all of these infinitely many histories diverging from each other, but that isn't what's going on. All these histories are at the same time merging back into each other, interfering with each other. The domain of the wavefunction of a quantum system is the tensor product of the domains of the wavefunctions of its constituent parts. The domain of the universal wavefunction already contains all possible situations, so the flow of probability amplitude into all possible outcomes is the exact same thing as the flow of probability amplitude from all possible histories. Most of that is just Feynman's path integral formulation, which isn't even a matter of interpretation. Everett just points out that the observer is also quantum, and obviously one should consider the bigger quantum system which encompasses the observer, until in the limit you consider the entire universe.
In case you weren't paying attention to my post, I don't adhere to "the" many-worlds interpretation, but here's a quotation from the preface to The Many Worlds Interpretation of Quantum Mechanics, (with my emphasis):
That isn't quite what Everett says in his thesis, but that's the most common version of the Everett interpretation used by its adherents today. In fact, every Everettian has a slightly different interpretation, insisting that it is "obvious" and ignoring that other Everettians say something else is also the only "obvious" interpretation.
At least Tegmark gave a shit back in 2003 about the distinction I mentioned (he calls the two things level I versus level III). I can't forgive him for the rest of his retardation though.
