Development for a fourth Rocky film began soon after the success of Rocky III, which faced controversy after it was subject to a copyright lawsuit. Principal photography began in 1984, with filming locations including Philadelphia, Wyoming, and Vancouver. Rocky IV was Lundgren's American film debut, and Stallone's last directorial effort until 2006; they engaged in authentic punching in their fight scenes, which led to Stallone being admitted to intensive care. Filming also featured new special effects and bona fide and groundbreaking sport methods and equipment, some of which were years removed from public use. Rocky IV is known for its strong Cold War themes, as well as its successful theme songs "Burning Heart" and "Living in America".
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