From the collection of Hans Perk; originally posted on his blog A. Film L.A. and reproduced here with his permission.

PROD. NO. UM-38    PROD TITLE "Mickey's Polo Team"    DRAFT NO. FINAL     PAGE NO. 5    DATE 1935
SEQ.NO __________    SEQ.TITLE _______________________________________________________________
Director _________________    ASST. DIR. ____________    LAYOUT MAN ____________    SEC'Y___________
SCENE NO.	ARTIST	SCREEN FOOTAGE	B. G. DATA	DESRCRIPTION OF ACTION
26	[Bill] Roberts			Duck leading - group on ball - swats ballout of scene.
27	"			Harpo riding toward duck - returns ball.
28	"			Ball stops - Harpo and Duck - Donkey and Ostrich crash - PAN UP - group through sc. - Harpo and Duck land in dust.
30	[Dick] Heumer			Closer view Harpo and Duck - into fight business.
31	"			Duck lands - ball in.
32	"			Duck tees ball.
35	"			Duck on Donkey - Crowd thru - Donkey and Duck into goofy fight business - Duck hurled in ground - ball in - tees on fanny.
36	"			Longer shot - Mickey in - swats ball - group follows - Duck ends with horseshoes on him.
37	"			Closer view - Duck shows horseshoes - squaks at players.
37A	[Bill] Roberts			Group on ball heading toward Duck - ball out.