This film's executive producer Stephen W. Sharmat once announced a series of seven Australian-American movies to be filmed in Australia with plans to raise $45 million in finance from investors in Australia and overseas. The Earthling (1980) was the first of these pictures and was the only one that actually got made.
According to the book 'The Films of William Holden' by Lawrence J. Quirk, director Peter Collinson was allegedly very tough on then child actor Ricky Schroder during filming to the point that co-star William Holden intervened. The two formed a close relationship and Schroeder about twelves years later in life, in 1992, named his son Holden Schroder after him.
Stephen W. Sharmat, this picture's executive producer, once said in 1980 of film production in Australia: "[In 1979] I discovered what a good place Australia was for movies . . . It's as good as Los Angeles, but it's far, far away, and hasn't the facilities of Hollywood. The answer to that is money - by which you can bring in filmmakers from America and Britain to produce pictures which will cross other countries' borders".
According to this film's American executive producer Stephen W. Sharmat, this American-Australian co-production filmed in Australia actually utilized only six American personnel compared to one hundred and twenty Australian cast and crew.
Dawn Gregg, the older sister of this film's leading co-star Ricky Schroder, appears in this film with him as Dalton. This is the only ever theatrically released film where the brother and sister both appear.
Stephen W. Sharmat said around the time of this film's 1980 theatrical release that Australia was "the world's best hidden movie secret . . . The Australian movie industry has been growing rapidly over the last few years, and it's now ready to handle Hollywood style productions".