Evil Under the Sun

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• When Poirot examines the hotel register for signatures of previous guests, he discovers the names of several international celebrities during the 1930s, including Cole Porter, whose music is featured in the film; Ivor Novello; Maurice Chevalier; Fred Astaire and his sister Adele Astaire); Charles Chaplin; and possibly Marlene Dietrich. An entry listing a home address is listed as Berlin, although the signature is illegible aside from the capital M and D). The register is likely a private joke by the filmmakers since it appears on-screen for only a brief second or two.
• Movie Goof (anachronisms): In the film, Patrick Redfern was wearing swim briefs ("Speedos") on many occasions (suntanning on the beach, steering a motorboat with Myra Gardener on board), but actually, the film was set in the 1930s or 1940s, when the male "overall" swimsuit (one that covers everything between the neck and thighs) was the norm. It was not until well into the 1960s that Speedos went into fashion.
• Movie Goof (continuity error): As the Gardeners sit on the terrace watching Arlena's arrival, Odell calls Myra "Myrna."
• Peter Ustinov designed the bathing suit he wears in one scene in the movie..