- Engaged for several months of 1943 to Maria Riva, daughter of Marlene Dietrich. Many years after Haydn's death, Riva spoke with great affection (in her biography of her mother) of his kindness and warmth.
- Reprised his Edwin Carp character on an episode of The Dick Van Dyke Show.
- Almost as well-known in Hollywood for his passion for gardening as for his acting. His friend (and sometime next-door neighbor) David Niven once joked that Haydn only took acting roles in order to pay for the planting of his famous garden's flora and fauna.
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