The major clue/reveal at the beginning?? (spoilers)
Tara is texting Amber at the beginning of the movie. All of a sudden, Amber says that "this is not Amber" after Ghostface calls/threatens Tara.
And then later on...it's revealed that Amber really is Ghostface.
So why didn't Tara ask Amber after the attack about what happened with the texting? Why wasn't Tara suspicious of Amber and that she possibly was involved in the attack? Since Amber knew about what was going on? It's been since January since I've seen this, but this question has been on my mind.