Okay, I went to Blog Critic's and read the synopsis. I don't see anything about a motorcycle crash. Maybe I'm just thick in the head. :\

I'm not convinced that script sounds genuine. It seems too frenetic for a House episode. Also, it's a rather euphoric prelude to the rest of the arc. Maybe that's why it was scrapped.

No matter how much GY wants to play with our heads, I quite agree there were alternate scenes shot. It's too costly to have those set ups with the crew just to fool the public. So maybe they're going to work some of it into the finale, and slip in the motorcycle crash.