I had to read this a thousand times! I loved it -- I swear I had the only 2-year-old girls that knew "Sphinx" "Pisa" "Paris"(Eiffel Tower) "America" (Statue of Liberty). Good, good story.
A mouse stays up late to see Santa, and then hides in his sleigh to travel along. He is discovered but Santa isn't mad--and takes him home. Good pictures: slightly realistic but still animation-esque.