John Phillip Law replaced Brian Kelly in the central role of Robin Stone. Law was a last-minute substitute for Kelly who less than two weeks prior to shooting was seriously and near-fatally injured in a motorcycle accident. Law, considerably taller than Kelly, was compelled to wear some of Kelly's original wardrobe, and the too-short clothes are apparent in the final film. Source novelist Jacqueline Susann had earlier said of Kelly that he was "the perfect Robin Stone".
The original casting call for the lead role of Robin Stone had been an American wide search across the USA which resulted in the original casting of Brian Kelly before he had to be replaced by John Phillip Law due to a motor-bike accident.
The film's "The Love Machine" promotional title logo formed the letter "O" in the word "Love" from the female venus symbol as had been done previously with published editions of the film's source novel.
The meaning and relevance of the film and source novel's "The Love Machine" title is that it is a reference and nick-name of the lead central character of Robin Stone (John Phillip Law) who is a sexy charismatic upwardly-mobile womanizing television executive.