The scene in which Eliza accidentally swallows a marble whilst having an elocution lesson does not appear in the original play. During rehearsals for this scene a pained expression came over Wendy Hiller's face; when she spat out the marbles she had in her mouth she said, "Leslie, I've swallowed one!" to which Leslie Howard replied: "Never mind there are plenty more." This caused such amusement among the watching crew that it was added to the film.
When George Bernard Shaw died in 1950, his home in Ayot St Lawrence became a museum. One of the artefacts in it is his Oscar, which initially had become so tarnished that the curator assumed it had no value and had been using it as a door stop. That situation has since been rectified.
George Bernard Shaw was the first person to have won both the Academy Award and the Nobel Prize. Some sources incorrectly list former US vice president Al Gore as another person who won both prizes. Al Gore did win the Nobel Peace Prize, however, the Oscar for Gore's documentary An Inconvenient Truth (2006) was given to the film's director, Davis Guggenheim. There wasn't another Oscar winner to become a Nobel laureate until Bob Dylan won the Nobel Prize for Literature in 2016.
In British prints, Leslie Howard utters the word "damn". In American prints he says either "hang" or "confounded". This was a year before David O. Selznick famously tussled with the Hays Office over permission for Clark Gable to say "Frankly, my dear, I don't give a damn" at the end of Gone with the Wind (1939).
Although George Bernard Shaw expressed indifference about the Academy Award he won for writing this film, his friend Mary Pickford reported that he proudly displayed the Oscar in his home, showing it off to his visitors.
The original Broadway production of 'Pygmalion' opened at the Park Theater opening October 12, 1914 and ran for 72 performances. The play premiered in a German translation at the Hofburg Theatre in Vienna on October 16, 1913 and in English at His Majesty's Theatre in London on April 11, 1914 and starred Mrs. Patrick Campbell.
Cathleen Nesbitt, billed as Kathleen Nesbitt, appears in a role credited only as "A Lady". Eighteen years later, she would originate the role of Mrs. Higgins in the original Broadway production of My Fair Lady.