Here’s the gag reel.
Sam Jackson, cursing like we always want him to.
It’s just a brief look at the giggles, with the rest being kept back for the upcoming home video release of the film which will also include making of featurettes and a commentary. The most interesting thing is that Joss Whedon has previously mentioned a whole lot of material which was deleted from the film and promised it would be on the DVD and blu-ray. He wasn’t interested in making a directors cut but there could be up to 30 minutes of new stuff on there.