My earlier theory about Garfield only being produced by clip-art seems to have been borne out today; apart from the speech/thought balloons and a couple of inner detail lines, the first and third panels of today's strip are exactly identical, and the second panel differs only in Jon's facial expression. The character outlines in all three panels are the same.
Once I've finished making some more changes to the blog code, it'll be time for the Jim Davis Lazyometer (patent pending).