Help with camera tracking - skips at the start, massive glitch toward the end.

Ok, here is the vid:

http://dl.dropbox.com/u/28372036/Anim1.wmv (Video download, as I don’t have youtube)

At the start, Suzanne skips a little bit for one frame. This is all right, I can live with that. But toward the end, everything messes up. Help?