Sony and Their Many Monty Python and the Holy Grails

Quick! What's the difference between the Collector's Edition, Special Edition, 40th Anniversary Edition and Extraordinarily Deluxe Edition of Monty Python and the Holy Grail ? It's a comedy classic and, apparently, money in the bank for Sony, who seemingly re-release this film on home video every year in a new edition. And I bet even the people who worked on them couldn't keep them all straight.…