First Page and Archived Pages
The script as it is doesn't seem to work for me on the first page, but archived pages work. The difference is the small comment Ryan puts at the top of the first page some times, e.g: "merry christmas and happy holidays! dinosaur comics is in CRAZY RERUN MODE until the new year. i'm running some favourite strips from the mysterious past!"
I've made a small modification to the script locally which fixes the issue, but isn't terribly elegant:
--- dinosaur_comics_easter_e_old.user.js 2008-12-31 13:33:40.000000000 +0000