Continuity mistake: The white carnations in the vase on the piano (Higgin's study) move around from shot to shot during the scene immediately after the Embassy ball.
Continuity mistake: While Higgins is singing in the opening scene, he is sitting on a pillar and leaning over. He is shown leaning back up, but then the shot changes and he gets back up again.
Continuity mistake: In the song "I'm Getting Married in the Morning" there is a bottle of gin or something similar on the bar. When the bar-lady pours Alfred a drink, the bottle is close to the bar handles (those knob things in local pubs, they control the amount of beer pouring out), but as the song progresses the bottle gets further and further away from the bar-lady. DVD Showing.
Continuity mistake: When Prof Higgins orders Eliza to sit down, he points with his right hand; the next moment, from a different angle, he is lowering his left.
Continuity mistake: Watch Professor Higgins during the 'You Did It' number after the Embassy Ball. He sits down, taking off his shoes. At one point, he has a shoe in one hand and a cigar in the other. The cigar shoots to the other hand and the shoe disappears, then it goes back.
Continuity mistake: When Eliza is singing 'I could have danced all night' her maids help her put on her nightdress. The sleeve on the left arm is left undone as she enters the bathroom and is washing her face. However as she exists the bathroom the sleeve can now be seen tied up.