Frankenstein 1970

The Breen Office ordered a number of changes in both the film's script and its original cut. One of the changes that was ordered was of the sound of the device that Baron Victor von Frankenstein used to dispose of the body parts that he was using to create his monster. The original grinding sound that the device made while doing so was considered too horrific, so it was replaced with the sound of a flushing toilet, which resulted in unintended laughter from audiences. This was believed for a long time to be the first time ever that the sound of a flushing toilet was heard in a U.S. film. UPDATE: A toilet was also flushed in the film The Grapes of Wrath (1940), which was released 18 years before this one.

The film says that the Baron's ancestor's experiments began in 1740. "Galvanism" (a.k.a. electricity) was a central part of Mary Wollstonecraft Shelley's novel "Frankenstein; or, The Modern Prometheus" (1818) - but in 1740 Luigi Galvani was only 3 years old and his discoveries were not published until 1791. The use of cars, telephones and electrical devices in all of the previous Frankenstein films that were released before this one suggest that the experiments took place closer to the 1880s. No explanation is given for this mistake.