- Diana's best friend was Carole Landis. Diana gave Carole a gold cross in 1938 that she wore for the rest of her life, and was buried wearing.
- William Powell and Diana knew each other for only a few weeks when they eloped. He had previously been married to Carole Lombard and engaged to Jean Harlow at the time of her sudden death.
- Sister of actress Maxine Lewis and composer J.C. Lewis.
- Remembered by fans of W.C. Fields' movies as Miss Dunk in It's a Gift (1934). As Fields tries to sleep on an upstairs front porch, Miss Dunk carries on a shrill, repetitious and reiterative palaver with her mother Josephine Whittell over whether to purchase ipecac or syrup of squills.
- Stepmother of William Powell.
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