This film contains about 20 minutes of footage from a film by Edgar G. Ulmer called "The Warning Shadow" (aka "Love's Interlude"), which was started in 1932 but never completed.
The only film other than The Wizard of Oz (1939) to feature in its cast both Jack Haley and Bert Lahr.
Blossom Seeley's debut. (Contrary to the previous comment Blossom Seeley's cinematic debut occurred six years earlier in an extant and excellent Vitaphone short.