Memorization of individual examples -> generalization, I can't speak about the determinant of switching as that is (partially, to some degree) work I'm working on, and I have a personal rule not to share work in progress until it's completed (and then be very open and explicit about it). My apologies on that front.

However, I can point you to one comment I made earlier in this particular comment section about the MDL and how that relates to the L2 norm. Obviously this is not the only thing that induces a phase change, but it is one of the more blatant ones that's been covered little more publicly by different people.