The voices of Mischa Auer (The Professor) and Frédéric O'Brady (Oscar) were dubbed by writer, producer, and director Orson Welles.
Until recently, the version in possession of Corinth Films was generally regarded closest to Orson Welles' cut. In April of 2006, the Criterion Collection released a comprehensive three-DVD set of this movie, featuring three versions: the "Corinth" version, "Confidential Report" (the European cut), and the newly edited "Comprehensive" version. Each version contains a few shots or lines that are missing from the other two. Because this movie was taken out of Welles' control in post-production, it will never be known exactly what he had in mind for the complex flashback structure of which he spoke later in his life. "The Comprehensive Version", which airs on Turner Classic Movies, runs one hour 47 minutes.
The voice of the announcer at Munich Airport is that of writer, producer, and director Orson Welles.
Maurice Bessy ghost-wrote the "Mr. Arkadin" novel that was released shortly after the movie premiered. Though Orson Welles is credited as the author, he didn't write a single word of it. He later claimed never to have even read it, let alone written it. It is nevertheless a very good guide to the movie, filling in a lot of background detail.