The working title for this movie, "Café Europa", is also the title by which the movie is known in a number of European countries (Germany and Italy amongst others).
Despite the European locale, all of Presley's scenes were filmed in Hollywood.
All of the main cast scenes were filmed in Hollywood on indoor sets, in front of process screens, and on backlots. Location and exterior shots were filmed in Germany, but they used stand-ins and were intercut with the process-screen shots.
The song "Pocketful Of Rainbows", seemingly a duet with Elvis and Juliet Prowse, had Prowse lip-syncing to an unknown backup singer's vocals.
The boat Elvis boards ("Bonn"), is now in Karlshamn, southern Sweden, and is used as a discotheque.
The 32nd armored was Elvis's regiment when he was in the army and in this movie.
Jan Shepard's baby was offered for the role of little baby on the film.
Princess of Denmark, Norway and Sweden, King of Thailand and other royalties visited on the studio and met Elvis Presley.
While Tulsa (Elvis Presley) is singing "Doin' the Best I Can", one soldier puts a coin in the jukebox and choose from the list "Blue Suede Shoes - Elvis Presley".