The major observational effect the progenitor star has on the supernova is due to the fact that blue supergiants are smaller than red supergiants, it was not as luminous as the majority of a previous core-collapse supernova.
A supernova from a star of that mass should be about 10 times brighter than SN 1987A was. It's thought that it prematurely detonated as a blue supergiant rather than a red supergiant because of some unknown factor.
Because are smaller than red supergiants and were less bright than the bulk of a previous core-collapse supernova, the progenitor star's influence on the supernova was most obvious.
Until it reaches the density of an atomic nucleus, the core gravitationally falls inward before rebounding. The envelope explodes forth as it strikes this rebounding core as it is falling in.
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