The Two Arabian Knights sub-series (1924-1931) contains screenplays, newspaper clipping volumes, actor and distribution contracts, reports for film expenditures and theatrical release revenue, and black-and-white photographic prints and negatives. Premiering on September 23, 1927 at the Million Dollar Theater in Los Angeles, California, this was Howard Hughes’ first film produced under his production company, The Caddo Company, Incorporated.

Publicity stills in the sub-series depict the principal and supporting cast at the film’s premiere. Direction stills portray scene direction and outtakes with director Lewis Milestone on set. Screenplays include Donald McGibney’s original magazine story and scene summaries. The newspaper clippings feature publicity for the release of Two Arabian Knights. The financial reports detail film production expenditures, and domestic and international receipts for film rentals. Lastly, contracts in the sub-series are of principal and supporting actors, and United Artists Corporation distribution.

The Mating Call sub-series (1927-1929) is comprised of materials pertaining to the film's editing, legal, financial, production and direction, and story development records. Under director Lewis Milestone and producer Howard Hughes, The Mating Call was released on July 21, 1928 and starred Thomas Meighan, Renée Adorée, and Evelyn Brent. It was considered a lost film until 2016.

Editing records include multiple censor requests. Legal records include agreements for Renée Adorée and Evelyn Brent, Rex Beach’s agreement for story rights, and supporting actor contracts. The financial records are reports of domestic and international revenues. The production and direction records contain black-and-white photographic prints and a negative depicting principal and supporting cast, interior and exterior sets, and publicity images, as well as a production report ledger. The story development records include a manuscript copy of the story, a production script, and cutting and dialogue continuities.