Darling Lili began as one part of an ambitious four-picture arrangement Blake Edwards signed with Paramount in 1967, with Julie Andrews attached to star and a planned budget of approximately $6 million. The production rapidly became a monument to studio overreach. Edwards wanted to stage the First World War aerial sequences in South Carolina, but Paramount insisted on using the replica aircraft assembled in Ireland for The Blue Max. The decision proved extraordinarily expensive: aerial filming in Ireland reportedly cost about $70,000 per day, and production later moved to Belgium, where filming still cost roughly $50,000 daily. Political unrest during the May 1968 protests in France also forced the filmmakers to abandon much of their planned Paris work and substitute Brussels locations. Edwards later claimed that the picture rose from an $11.5 million estimate to $16 million, while the final production cost was eventually placed at approximately $25 million, making it one of Paramount's most expensive musicals.
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