Didn't the events of the movie get shuffled around in editing? Specifically, the Grissom crew found Spock's alive body before Serek talked to Kirk? It could explain why Serek and Kirk seemed to know stuff they shouldn't quite yet.
Yes, the events of the movie got shuffled around in editing, but that is only an out-of-universe cause for the descrepencies, not an in-universe explanation for the continuity as presented in the final product. I need an in
-univese explanation, even if it is a completely manufactured one never intended by the creators. As long as it works for me, I'm good.