At around the 4:22 mark, you can see a mouse cursor around the top right hand corner of the screen. And no, that is not the uploader's fault, it's just in the game. I thought it was pretty funny, so yeah, here ya go if you didn't already know about it.
Also, I'm pretty sure you can see it in one of the trailers as well.
I love the game, but that is hilarious. Peek-a-boo mouse, right there in the intro...
That is just nuts. When I edit videos and I'm mixing them with timing/music and such, I watch them over and over and over again to make sure everything is perfect. And it's just a hobby for me... these people are getting paid.