I agree with CP...the tires looked odd to me even before I read his posts. Note the second to last tire on the ramp...it hits the last one, bounces backward, then starts to roll up the ramp. The first tire on the ramp appears to accelerate after its initial push.
As for the muffler, it does look a little like it could have some outside force acting on it...and it wasn't blown by the fan, because the fan was facing the other way. The only force the fan exerts on it is indirectly, through whatever's on the wire (The muffler moves after the thing hits it). The last roll does seem a bit iffy to me...hmm...
The spinning windshield wiper also bothers me, since it seems to spin much faster than it should.
And the speakers bobbing also bothers me...
The entire ad seems too smooth to me as well...I'd like to see a "Making of" video to prove this one was real.