Cuando los dinosaurios dominaban la Tierra

A 27-word "caveman language" was created for this film, supposedly drawing on Phoenician, Latin and Sanskrit sources. Some of the key words in this language are "Neecha", meaning "Stop" or "Come back"; "zak", meaning "gone" or "left"; "Akita", meaning "Look" or "See"; "neecro", meaning "bad" or "evil"; "m'kan", meaning "kill" or "killed"; "mata", meaning "dead"; "Yo Kita", meaning "Go".

Dinosaurs had already been extinct for millions of years before human beings in their now-recognizable form first appeared on Earth.

Several nude scenes were made for the film, but were cut from the original U.S. theatrical release of it in order to ensure a "G" rating. They include a scene of Tara (Robin Hawdon) and Sanna (Victoria Vetri) making love in a cave, a scene where they both go skinny-dipping in a lake and a scene of Tara taking off Sanna's clothes on the beach. The aforementioned nude scenes remained in the uncut UK version, however (as Vetri revealed in a 1984 interview). This version has also officially been released in the U.S. at last on Blu-ray on February 28, 2017 and on DVD-R on April 4, 2017 by Warner Archive.

Edited from El mundo perdido (1960)