Quote Quoting DavidSeven (view post)
Shenanigans? We're to believe he simultaneously finished principal photography on a separate film while doing post on The Avengers? Google turns up nothing on this so-called "Bellwether Pictures". I'm calling hoax or inconsequential short right now.
If it's a joke (and I could totally see Whedon & his gang pulling this), it's a pretty clever joke.

Right now I'm with you. I have a little trouble believing they shot even a fraction of the play in the same amount of time it took to produce Dr Horrible.