By all accounts, Frank Sinatra was at his most obstreperous throughout the making of this film. Among other things, he refused to use the car supplied him by the studio, insisting upon having his Ford Thunderbird flown all the way to Spain at the studio's expense. In addition, he almost caused an international incident when he hung a banner from his hotel room window reading "Franco is a Fink", referring to Spain's dictator, Francisco Franco. In hindsight, Sinatra referred to the whole experience as "underwhelming".
With seven weeks of shooting in Spain still left on the schedule Frank Sinatra, who hated Spain, told Kramer, "Hot or cold, Thursday I'm leaving the movie. So get a lawyer and sue me," according to Kramer biographer Donald Spoto. Kramer tried to solve the problem with two days of shooting in a Hollywood studio with potted palms.
This was one of two films Sophia Loren and Cary Grant starred in together. Cary was totally in love with Loren and the two had an affair. However, Cary was too much in love with Sophia to the point of obsession. This frightened her and sent her straight into the arms of Carlo Ponti.