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  • Victoria Vetri revealed in a 1984 interview that the U.K. version of the film contains nudity. The nude scenes include her character Sanna making love to Tara (Robin Hawdon) in a cave.

  • A 27-word "caveman language" was devised for this movie, supposedly drawing on Phoenician, Latin, and Sanskrit sources. Some of the key words in this language are: "neecha" is "stop" or "come back"; "zak" is "gone" or "left"; "akita" is "look" or "see"; "neecro" is "bad" or "evil"; "m'kan" is "kill" or "killed"; "mata" is "dead"; "yo kita" is "go".

  • In March 1971, Warner Brothers cleverly distributed this film in the USA on a double bill with the similarly themed dinosaur film The Valley of Gwangi (1969).

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