This is my first time posting over here on the Unspooled message board, but since Double Indemnity is my absolute favorite movie of all time I thought I'd chime in with some of my thoughts regarding the film.
1. Every time Edward G. Robinson is on the screen in this film does for me what I often hear people who discuss Heath Ledger' s Joker does for The Dark Knight (and deserving so: Ledger was a revelation in that roll of course). One of my favorite aspects of Keyes' character is that, true to his last name, he's able to gleefully unlock Phyllis and Walter's scheme (up to a point), even going so far to realize that Mr. Dietrichson wasn't even on the train, but rather a "someone else" posing as him. Papa's got it all figured out.
2. Paul questioned a couple of times why this movie has never been remade, but it actually was. In the mid-70's Double Indemnity got a hilariously abyssal, shot-for-near-shot made-for-TV update starring Rambo's William Crenna. It came as a bonus disc with the remastered Universal Legacy Series edition of Double Indemnity, and deserves a HDTGM outing all its own (the TV version, that is). One of the most entertaining scene in the remake is when the main characters "attempt" the famous "How fast was I going, officer?" scene, and it just deflates right there in front of the camera before the scene gets going, as if the actors just got tired and gave up.
3. When he wasn't ripping off Quentin Tarantino's early films wholesale, British director Guy Ritchie would find time to lift and mutate lines of dialogue from other famous films as well. For example, here's a line of dialogue from Benicio Del Toro's Franky Four Fingers in 2000's Snatch "I am not in Rome, Doug. I'm in a rush," which is a simply variation on Keye's "Well, we're not in Medford now, we're in a hurry." Revenge for what we did to The Office? Who knows?
4. Billy Wilder's follow-up, The Lost Weekend is a direct jab at Raymond Chandler, as the character in that film is supposed to be Chandler himself.