Fakie wheelie anyone?

I am not sure you can really extract that kind of information from an NTSC (30fps) signal (did you download the HD original from Vimeo ?).

Regardless, whichever way the bike is going the wheel (top) will spin in the direction of motion - so even if played backwards (or really going backwards) will still be spinning in the right direction (ie: it is not an indication of visual trickery).

Of course I'm not sure :-) I thought it would spin backwards in both cases, but I dind't know, that the force of inertia is stronger than the force of gravity (hope my english is english enough) - never really observed the behaviour, as I don't do tricks. I'm sure you know more in this matter, so I'm not going to argue.