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.
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