'Joan Crawford' said that she agreed to the film because she found the subject of the story "interesting".
'Joan Crawford' went out of her way to help an aging 'Herbert Marshall' with his lines.
'Joan Crawford', then on the Pepsi-Cola board of directors, demanded that product placement shots be included in all her films of this era. Look for it here prominently advertised on the sides of dispensing carts at a mental hospital picnic.
From The Washington Post, May 22, 1963: "So impressed were Senators Lister Hill and Thomas Kuchel with 'The Caretakers,' a film on mental health, that they arranged a showing for senators and their staffs this afternoon in the New Senate Office building. The extra attraction: a post-screening reception in honor of stars Joan Crawford and Robert Stack, writer Henry F. Greenburg and producer Hal Bartlett."
This was the only film that featured Virginia Munshin as she died at the age of 30 on July 8, 1962 from a cerebral hemorrhage.