It could also be that blue vs. purple was some kind of consequence of variance in the photochemical processing. Perhaps one batch of prints came out more blue, others more purple? This could explain why Beber's screening, kaosjm's screening and the 8mm point to purple, and TylerDurden's screening and that one 2013 screening that the camcorder YouTube clips come from, point more to blue or teal.
As I said, on the VCL DVD screenshots the night scenes look purple, but when I did some very rudimentary color-correcting on them to remove the tint from the Carolco logo, they went back to blue. (But the explosions in the future war screenshots stayed yellow...)