Lee De Forest made a short film Songs of Yesteryear (1922) of Mitchell singing, using his DeForest Phonofilm sound-on-film process.
In 1926, Gill appeared in two short films made in the DeForest Phonofilm sound-on-film process, Santa Claus as the title character, and Julius Caesar as Brutus.
In 1927, he appeared in a short film, made in the DeForest Phonofilm sound-on-film process, singing "If Your Face Wants to Smile, We'll Let It In" from the revue John Citizen's Lament.
On 15 April 1923, she appeared in a short film, "From Far Seville", made by Lee de Forest in his Phonofilm sound-on-film process, and shown at the Rivoli Theater in New York City.
The song was recorded in 1923 for a two-reel short film made in the DeForest Phonofilm sound-on-film process.
In 1923, Fain appeared with Artie Dunn in a short film directed by Lee De Forest filmed in DeForest's Phonofilm sound-on-film process.
His last credit as cinematographer was Love's Old Sweet Song (1923), filmed in the Lee DeForest Phonofilm process, and starring Donald Gallaher, Louis Wolheim, and Una Merkel.
It was produced by Lee De Forest, whose process, Phonofilm, enabled a soundtrack to be played alongside the film (a year before The Jazz Singer).