I've come across a few odd glitches, sometimes it will drop more balls than you have, sometimes it will drop them all at the same time as one ball, and, more frequently, the ball dropper will go off screen causing you to have to refresh the page
it could just be my computer, but for some reason I can hit space a bunch of times and instead of him jumping regularly he'll lag then fly really high up into the sky, especially bad with the on foot parts
there is a facebook remake of this game called "Vector" it has better graphics a level system and a trick... thingy. but somehow this game is still better