I agree that the trailer isn't as good as it could have been. When people ask me 'What is Grim Fandango?' it would be nice if there was a better trailer I could show them but instead I have to point them towards the demo. However I don't think it's quite as bad as you make it out to be... I'd give it a 6/10.
Originally Posted by Grim_comician
I've spotted a few things that aren't like the original game, most of all the festival with people like Olivia. And some minor stuff too, like Meche in S.S. Lambada without holding a bottle which was meant to throw at Manny. Or, when Manny takes off his cloak in his office but doesn't talk.
There are a few high resolution renders of some of those un-included content here