Thanks for the input and thanks for putting up the pics with the frame numbers. It will make it much easier to find and fix! I'll make sure and fix those tonight. You must have very keen eyes to find this kind of stuff. Is it possible to interpolate the last or first frame in a scene btw?
EDIT: ok they are fixed. Could you also check in between frames 155980-155990 and let me know what you think that is?