- When Louis attacked with a knife in the film, he hit the attacker with a punch, making him unconscious. Although the sound effect is audible, but from the film you can see that the fist cannot be connected
- In the movie, at the boat berth, when Louis murdered someone for the first time, he was completely wearing clothes and swimming in the water. However, Louis did not bring a change of clothes or even a towel to dry. After he committed the murder, he rowed the boat downstream. But soon, his clothes were dry.
- In the film, when The Hangman opened the peephole of the cell, he moved the cover with his finger to the right. After staring at the back of the prisoner's neck for a few seconds, the scene returned to the door. When The Hangman closed the cover on the peephole, it went from left to right, not from right to left. This was realistic.
- Alec Guinness de Cuffe played eight roles in this film.
Kind Hearts and Coronets behind the scenes gags
Kind Hearts and Coronets quotes
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Edith: But I have often felt that the attitude of my husband's family has failed to move with the times. That they think too much of the rights of the nobility and too little of its duties. The very honesty of your behavior would appear to me to prove them wrong.
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Louis Mazzini: The D'Ascoynes certainly appear to have accorded with the tradition of the landed gentry, and sent the fool of the family into the church.