Special makeup effects artist Rick Baker says that Harry is his greatest and favorite character that he created.
While in makeup Kevin Peter Hall's already immense height (7'2) was increased to over eight feet. This is evidenced by John Lithgow (who stands at 6'4") when he stands next to Hall.
The filmmakers kept Harry a secret prior to the film's release - only glimpses of him were shown on all publicity materials and theatrical trailers. Although a wise decision for the film, this was also blamed for the film not being more successful than it actually was due to it not selling the fact that a Bigfoot was the star of the film. As a result, the film was renamed 'Bigfoot & the Hendersons' in many overseas territories, and much of the artwork now featured Harry also. The film however has reverted back to its original title in the DVD and Blu ray age.
Kevin Peter Hall said that the role of Harry was his favourite role.
The statue in Dr. Wrightwood's place of business is the gremlin from Nightmare at 20,000 Feet (1963). John Lithgow starred in a remake of the same sketch in Unheimliche Schattenlichter (1983).