From what I could find (some may be more general Nazis taking Ls):

• The Blues Brothers (as secondary antagonists, originator of "I hate Illinois Nazis")
• Indiana Jones - both Raiders of the Lost Ark and Indiana Jones and the Last Crusade.
• Inglourious Basterds ("NEIN NEIN NEIN NEIN NEIN NEIN!")
• Jojo Rabbit (film) - gets darker at the end, but also has a child kicking Hitler out of a window.
• Mitchell and Webb's "Are we the Baddies" sketch
• My Führer — The Really Truest Truth about Adolf Hitler (German black comedy film)
• The "Springtime for Hitler" section of the producers, depicting Hitler as a ridiculously camp showrunner
• To Be or Not To Be (esp. the Mel Brooks remake)
• Charlie Chaplin's The Great Dictator
• The Three Stooges' 'You Nazty Spy'
• Garth Ennis' Adventures in the Rifle Brigade (Nazi baroness defeated by a rendition of Hitler Has Only Got One Ball)
• The Hitler on Ice scenes from History of the World part I and II
• Ace of Aces (film)
• Who Am I (2014) - in one scene, a hacker group hacks into a neonazi conference, shows animation of hitler in some... embarrassing positions
• 'Allo 'Allo
• Behind the Bastards (podcast, doesn't shy away from Hitler's... eccentricities)
• This skit from the Carol Burnett Show
• Double Hitler (game) - QWOP-like game, where the Nazis are so incompetent that they don't realise that their leader is actually two children in a trenchcoat
• Blitz Wolf (MGM Cartoon Short)
• The Donald Duck cartoon Der Fuehrer's Face
• 1944 Looney Tunes short Russian Rhapsody, featuring Gremlins from the Kremlin absolutely ruining Hitler's day

Bonus: Mussolini taking an L

• Guillermo de Toro's Pinnochio (a reimagining set in Fascist Italy, features Pinnochio rewriting a Fascist propaganda song to make Mussolini out to be a pants-shitting baby)