JPEGsnoop does not understand part of a file?

[torndar]

I have two copies of a thumbnail for a Canon camera video. They are binary different but it seems that everything in the files that JPEGsnoop can decode is identical and I don't see anything in the decode output that covers the byte addresses that differ. I have "Maker Notes" decoding turned on but the section that is different is after the last of the maker notes data and before the actual image data from what I've been able to tell. I can upload the files if someone is willing to take a look at them.