Comic Book Resources posted a new article on an "comic book legend" where the rolling boulder scene from "Raiders of the Lost Ark" was an homage an "Uncle Scrooge" comic by Carl Barks:
http://goodcomics.comicbookresources.com/2007/12/13/comic-book-urban-legends-revealed-133/
http://goodcomics.comicbookresources.com/2007/12/13/comic-book-urban-legends-revealed-133/