The phone calls (specifically final one) SPOILERS

So, just saw this flick for the first time yesterday. Maybe it was the frame of mind I was already in when I watched it, but, while I wasn't blown away by it, I didn't feel the hatred for it that seemingly so many of you do.

Anyway, obviously the phone conversions were a large part of what the escalating plot was built on, and a catalyst for the mystery. It hadn't really occurred to me when Jess remarked after being put on speakerphone with Gabriel that Donna's and Pete's voices sounded very similar, but then when I thought about it, I felt he had a legit point. Now, in terms of the actual practical production of the film, clearly some of the times it was without a doubt Toni Collette talking on the phone, some of times it was without a doubt Kieran Culkin talking on the phone. Obviously though, especially as it gets later on in the film, you as the viewer are supposed to wonder if it really is just one single person the entire time.

I wonder though if anyone else agrees, that the VERY LAST phone call that Gabriel gets, when he's gone into the motel room that was vacated by Donna where she's left the video tape, it's "supposed to" be Pete calling Gabe, at any rate the person's claiming he's Pete, but on that call more than any other, it was 100% crystal clear to me that it was Donna (actress Toni Collette doing the voice), from the first words spoken I had no doubt. And I think this was a very deliberate move from the director, to sort of drive the point home for the audience, I think he specifically made it obvious that it was her, simply pretending to be him, whereas previous conversations in the movie tone and pitch were made to be in such a way that it left you wondering.

I'm sure PLENTY of others picked up on this, right? That it was OBVIOUSLY Donna pretending to be Pete on that last call?