* BannedInChina: The film was banned in Finland between 1962-1986 because it was feared that the film would harm Finnish-Soviet relations.The Finnish Board of Film Classification allowed the film to be shown in Finland in 1986.
* FakeNationality: Lilo Pulver, the actress playing the German Ingeborg, is actually Swiss.
* FakeRussian: The Russian characters are played by Austrian and German actors.
* HostilityOnTheSet: Creator/JamesCagney named Creator/HorstBuchholz as the only actor he really hated working with because he was uncooperative and tried all kinds of scene-stealing moves, which Cagney depended on Creator/BillyWilder to correct.
-->I got riled at Creator/SZSakall [...] in ''Film/YankeeDoodleDandy'' for trying to steal a scene, but he was an incorrigible old ham who was quietly and respectfully put in his place by Creator/MichaelCurtiz. No harm in the old boy. But this Horst Buchholz character I truly loathed. Had he kept on with his little scene-stealing didoes, I would have been forced to knock him on his ass, which I would have very much enjoyed doing.
* RealLifeRelative: The guard at the Brandenburg Gate who is handed a six-pack of Coca-Cola when [=MacNamara=], Fräulein Ingeborg and Schlemmer drive to East Berlin, is played by Helmut Schmid, Lilo Pulver's husband.
* WhatCouldHaveBeen: Creator/MarioAdorf was offered an unspecified role in the film but turned it down.

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