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Working titles for this film were A Family for Jock and Sun in the Morning. A February 1948 Hollywood Reporter news item indicates that M-G-M bought the rights to Marjorie Kinnan Rawlings' unpublished story "A Family for Jock," retitled it "Mountain Prelude," and sold the literary rights to The Saturday Evening Post. The story appeared The Post and has never been published in novel form. A January 1947 Daily Variety news item noted that Elizabeth Taylor, who had appeared in the first "Lassie" picture, was originally set to star in The Sun Comes Up. The film marked the final screen appearance of Jeanette MacDonald, who left motion pictures to pursue her stage and concert hall career. Some filming took place on location in Santa Cruz, CA. The film marked Andr Previn's first screen credit as a composer. The first film for which he received screen credit as a conductor was It Happened in Brooklyn. For more information on the "Lassie" series, consult the Series Index and see the entry below for Lassie Come Home.