This was Mickey Rooney's last film.
In this, Mickey Rooney's last film, the last line he speaks was improvised - "Aye, but time is short." About a week after shooting this scene, Rooney died.
This film is one of the only adaptions of the story in which Dr. Jekyll and Mr. Hyde are played by 2 different actors
Filming took place in 2014.
The characters Louis and Stevenson are named for the author and do not appear in the source novel. They were apparently created for the cameos of Mickey Rooney and Margaret O'Brien.