Steven Spielberg and George Lucas have acknowledged that the rolling-boulder booby trap in the opening scene of Raiders of the Lost Ark was inspired by the 1954 Carl Barks Uncle Scrooge adventure "The Seven Cities of Cibola" (Uncle Scrooge #7).
Steven Spielberg dan George Lucas telah mengakui bahwa ranjau bergulir-batu dalam adegan pembukaan Raiders of the Lost Ark terinspirasi oleh Carl Barks 1954 Paman Gober petualangan "Tujuh Kota Cibola" ( Paman Gober # 7).