Full Idea
If events are instantaneous time-slices of a physical thing, the persistence of the pattern is an inexplicable fact in that there is no requirement for the successive time-slices to bear any resemblance to the event previously occurring at that place.
Gist of Idea
If things are successive instantaneous events, nothing requires those events to resemble one another
Source
Harré,R./Madden,E.H. (Causal Powers [1975], 6.IV)
Book Reference
Harré,R/Madden,E.H.: 'Causal Powers: A Theory of Natural Necessity' [Blackwell 1975], p.110
A Reaction
The Humean four-dimensional view doesn't seem to require an explanation of this (or of much else), and takes it as a brute fact that slices resemble. Something has to be a brute fact, I suppose.