I don't see that happening in my example. The idea of different realities is interesting but doesn't work when we have cause and effect.
I'm not sure to which cause and effect you are referring.
If* gravity is working on everything at all times, albeit infinitesimally, then I would think that there can't be different realities, my actions will influence your future and yours mine. There can be different subjective observation but not different factual realities.
It is because just one copy of you can only experience one reality. Other copies of you experience other realities. Each is unaware of the other, and each is slightly different. Each copy of you can experience different time lines.
Your actions may influence my future -- you might collide with me when you are going at such a reckless speed. However, you are only affecting one copy of me within the reality you experience. Another copy of me continues on in another reality unaware that anything happened because you arrived 3 seconds later, or maybe you never arrived at all, for example.
The loaf represents all of these possibilities as different realities.
While the concept of multiverses and multi-realities is as philosophical as it is controversial, Greene states that the mathematics behind quantum physics supports the seemingly impossible set of multiple realities. In essence, we don't really know what time is. It certainly is a concept that moves forward
only for us in this reality. In others, time might run backwards, or not at all.