The upcoming (March 2011) german DVD and BD release of the Grindhouse feature is at the moment stated to contain the Fake Trailer "Hobo with a shotgun" . If it's true this would be damn cool, because neither the US Bd nor the jap. DVD seems to feature that trailer.
Regarding Face Off:
I won't say that this are compression artifacts. It seems to be the Filmgrain. Or could you specify the Point where you see the artifacts?