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Laszlo Vadnay and Aladar Laszlo's screen story was titled "Petticoat Fever." According to pre-production news items in Hollywood Reporter, Herman Schlom was initially slated to produce this film. In February 1944, Frank Strayer was assigned to produce, but was replaced by John Auer in early June 1944, before the start of production. Another Hollywood Reporter news item noted that an exact replica of the 1848 San Francisco Miner's Bank was built for the picture. Girl Rush marked Robert Mitchum's RKO debut.