* Charles Chaplin got the idea when a friend, Alexander Korda, noted that his screen persona and Adolf Hitler looked somewhat similar. Chaplin later learned they were both born within a week of each other, were roughly the same height and weight and both struggled in poverty until they reached great success in their respective fields. When Chaplin learned of Hitler's policies of racial oppression and nationalist aggression, he used their similarities as an inspiration to attack Hitler on film.
* Charles Chaplin said that had he known the true extent of Nazi atrocities, he "could not have made fun of their homicidal insanity".
* Some reports refute Charles Chaplin's claims of ignorance as to the true extent of Nazi atrocities, stating that Chaplin was very much aware of the various goings-on, but decided to make the film anyway as an attack on Nazi ideology.
* Production on the film started in 1937, when not nearly as many people believed Nazism was a menace as was the case when it was released in 1940.
# When this film was released, Adolf Hitler banned it in Germany and in all countries occupied by the Nazis. Curiosity eventually got the best of him and he had a print brought in through Portugal. He screened it not once but twice. Unfortunately, history did not record his reaction to the film. When told of this, Charles Chaplin said, "I'd give anything to know what he thought of it."
# Although this movie was banned in all occupied countries by the Nazis, it was screened once to a German audience. In the occupied Balkans, members of a resistance group switched the reels in a military cinema and replaced a comedic opera with a copy of this film, which they had smuggled in from Greece. So a group of German soldiers enjoyed a screening of this film until they realized what it was. Some left the cinema and some were reported to have fired shots at the screen.
According to documentaries on the making of the film, Charles Chaplin began to feel more uncomfortable lampooning Adolf Hitler the more he heard of Hitler's actions in Europe. Ultimately, the invasion of France inspired Chaplin to change the ending of his film to include his famous speech.
# Charles Chaplin considered Adolf Hitler to be one of the greatest actors he had ever seen, while Hitler assumed that Chaplin was a Jew.
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# When Charles Chaplin first announced that he was going to make this film, the British government - whose policy at the time was one of appeasement towards Nazi Germany - announced that they would ban it. By the time of the film's release, though, Britain was at war with Germany and in the midst of the blitz, so the government's attitude towards the film had completely changed.