- The curious teenager who lives next door to the Hudson sisters is none other than Barbara Merrill, Bette Davis's real-life daughter.
- The wig Bette Davis wears throughout the film had, unbeknownst to both leads, been worn by Joan Crawford in an earlier MGM movie. Because it had been re-groomed, Crawford didn't recognize it.
- The clips of films starring "Jane" are actually clips from Bette Davis's films Ex-Lady (1933) and Parachute Jumper (1933). The clips of films starring "Blanche" are actually clips from Joan Crawford's film Sadie McKee (1934).
- During production, Bette Davis had a Coke machine installed on the set to anger Joan Crawford, whose late husband was an executive at Pepsi.
- During the kicking scene, Bette Davis kicked Joan Crawford in the head, and the resulting wound required stitches. In retaliation, Crawford put weights in her pockets so that when Davis had to drag Crawford's near-lifeless body she strained her back.
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