The film both opens and ends with a title card quotation from an Inuit Legend that reads: "I, who was born to die shall live. That the world of animals and the world of men may come together, I shall live."
Bruce Smeaton's score is not what was originally intended for the film. The score in the film is mainly needle drop tracks for most scenes. The score was recorded with 130 piece Hollywood Symphony Orchestra and was meant to have a fuller sound. The reason for this was because Director Fred Schepisi, who was fired and then brought back onto the project for post-production tampered with the film after it was locked. He'd shifted around dialog, scenes and such. According to Smeaton, "He'd (Schepisi) gone in and made 28 minor changes to the film just as we (Smeaton, Music Editor Jim Henrikson and Music Engineer Dan Wallin along with the Hollywood Symphony) were preparing to go into Glen Glenn Sound with 130 piece orchestra. The music wasn't fitting the scenes they were intended for. Fred (Schepisi) never showed up." Smeaton had to then cancel the sessions and edit down his music from what had they originally had been intended for. Smeaton admits to having regretted working with Schepisi and their subsequent film, Roxanne (1987) starring Steve Martin would be their last project together. Schepisi would have the late Jerry Goldsmith as his composer of choice during the 1990's.
One of the film's main movie posters had a long preamble that read: "HE'S 40,000 YEARS OLD. Deep within an Arctic glacier they found him, preserved by a miracle of nature, brought back to life by a miracle of science. Now medical science wants to exploit him in the name of research. One man wants to stop them...in the name of humanity. But he'll need more than a miracle to survive...he'll need a friend".
When Charlie is looking upwards to the helicopter, his open mouth reveals a large number of silver fillings. Such dentistry, obviously, wouldn't have been available during the stone age.