Pitt also played a soldier who cut off German scalps in Legends of the Fall, though in World War I that time. Aldo Raine also mentions a past in bootlegging, something Brad Pitt's character in the former was also involved in.
Eli Roth gets to do some of the more gruesome killings in the film. Coincidence? And this isn't the first time he's played a "bear"—in Death Proof, his character was named "Dov," which means "bear" in Hebrew.
Mike Myers doing a character with a faux-English accent who's involved with international espionage? Yeah, baby.
Actor-Inspired Element: Shoshanna's film for the Nazis was originally going to be in French. Melanie Laurent felt it would have more of an impact if it was in English, and it was changed as a result.
Quentin Tarantino decided that he wanted Bridget von Hammersmark's death scene to be very realistic so Tarantino put on a Nazi uniform, took Christoph Waltz's place, and choked Diane Kruger until she was unconscious.
Eli Roth joked that the period clothing helped make him especially aggressive, saying "wearing wool underwear will make you want to kill anything". His girlfriend also added Hannah Montana music onto his iPod to Troll him, which helped get him angry enough.
Christian Berkel, who plays a French bartender, is actually German.
Patrick Elias who has a small role as Shoshanna's father (who is French) is Swiss.
Fatal Method Acting: A near miss. During the climactic scene, the fire raging through the cinema was completely real. Unfortunately, it began to get out of hand, and the two actors in the scene were only wearing a jelly to protect their skin; the rest of the crew had fire suits. Ten seconds after Quentin Tarantino called 'cut' and everyone rushed off, the platform the actors had been standing on collapsed. The heat was so intense (2000 degrees fahrenheit) one of them passed out afterwards.
Michael Fassbender is half-German and fluent in the language, playing an English character who gets caught out for speaking German with an unusual accent.
Diane Kruger was nearly turned down for the role because Tarantino didn't think she was actually German. She lampshaded the Irony of her spending years trying to lose her accent to play Fake Americans, only to nearly miss out on a role of a German actress. She claims she had to exaggerate her accent to play Bridget.
Method Acting: Melanie Laurent worked as a film projectionist for weeks to prepare for her role.
The Other Marty: Simon Pegg was cast as Lt. Archie Hicox but dropped out right before filming began due to scheduling conflicts with The Adventures of Tintin. Michael Fassbender then replaced him.
Similarly Named Works: The "Inglourious Basterds" misspelling was likely to avoid a lawsuit by the copyright holders of the 1978 film "The Inglorious Bastards", which was also a World War II film. Though it might also be a reflection on Raine's illiteracy.
Also, at one point Ennio Morricone was onboard to compose the score but backed out due to his belief that he would be unable to work efficiently in the amount of time given.
In the screenplay, the first part of the film set in Paris was intended to have been filmed in black and white, using entirely natural lighting, in reference to the French New Wave.
As Quentin has noted, he at one point responded to the length of the material he'd written with a decision to make it a miniseries. As it stands, he's noted that he has enough for a second film, which he may or may not make eventually.
Michael Madsen was slated to appear as a character called Babe Buchinsky, but did not appear in the final film.
Jean Reno was the original choice for Perrier LaPadite.
Nastassja Kinski was in talks for Bridget Von Hammersmark; Tarantino even flew to Germany to meet the actress, but a deal wasn't reached.
The original draft of the script had Shoshanna as a far more active member of the French resistance, sniping at Nazis from rooftops and even having a kill list of known German officials. But when Tarantino made Kill Bill, those details were worked into the film, and he felt it was more in character for Shoshanna to keep a low profile.
The original draft also had Wilhelm surviving being shot by Bridget von Hammersmark, and he would tell Landa that she was the double agent.
Prior to coming out of retirement to star as Winston Churchill, Rod Taylor suggested Albert Finney for the part.