SYBIL JASON is the girl whose father dies and leaves her the owner of "Wonder Horse". The rest of the short film has Sybil in full Shirley Temple mode--laughing, crying, singing--but all to no avail. Let's just say it's best to remember her in the two Technicolor films she made with Shirley Temple in the late thirties.
As for the all-star cast, you get a fleeting glimpse of EDWARD G. ROBINSON and OLIVIA DE HAVILLAND, a bit of humor from FRANK McHUGH and HUGH HERBERT, some attempts at humor from AL JOLSON and RUBY KEELER, and an altogether sappy racetrack story that has been done in better films a hundred times over. Every cliché imaginable has been trotted out in the space of 18 minutes.
Summing up: No kudos for this one.