Although, Grahame-Smith says the beginning of the film isn't humorous and the final third of the film really isn't, so we shall see.
And as for TV shows possibly turning out differently than what advanced spoilers and/or staff remarks may lead viewers to believe, I can easily understand how that happens because TV shows are living, breathing things that can often veer off in different directions from what may have been planned once their scripts are actually written. I've read many interviews with TV show writers/producers/whatever in which that has been the case. (Though I've read them after the fact because, just like I'm avoiding spoilers for the DS films, I avoid spoilers for all the TV shows I watch because I like to see things unfold the way they actually do in the eps, as opposed to knowing way beforehand and it being less of a surprise and, therefore, it having less of an impact. And since I've never paid attention to spoilers, if things do actually turn out differently than advance info might have led viewers to believe, it doesn't phase me in the slightest.) For instance, I now know that the identity of the dead body on the beach in the pilot of Revenge changed many times between the time the pilot was shot and the recent ep finally revealing the identity was aired. (And just as an aside, if you're not watching Revenge, shame on you because it's one of the best shows on TV this season!)
On the others hand, it's not so much a case that those types of situations will happen with a film. Certain talked about scenes may end up on the cutting room floor (though these days they're often likely to show up as deleted scenes in the DVD extras), but trailers notwithstanding because they can often be misleading, it's a rarity when a film is described officially or in articles as one thing and it actually turns out to be something entirely different. That just wouldn't be very good business practice. And even in the case of The Blair Witch Project, even if it wasn't true in reality, at least within the premise of the film itself it was true that the footage was shot by real people and then discovered, so the concept of the film itself was not misrepresented..
33 days 11 hours 1 minute 9 seconds until the day the Depp/Burton Dark Shadows is released(ET)!!