I think it's a rather nice idea to have a game of BDs drawing errors, I guess its only for the most hardcore of his fans. I don't think there are too much anyway, but you never know...
I have one for his last C97 work Bisoku Zenshin: on page 19 (or 20 as BD numbers it), in the middle panel Mars' right arm was drawn incompletely.
There have also been some continuity errors I have noticed in the past, particulary with clothing disappearing and then reappearing, but I forgot which piece it was... If I find it again I'll post an update.
For me too BD is king, my favorite. Too bad there has not been any update from him since C97 at all, nothing, nada. Don't wanna stir anything, but I just hope he has not retired.