MUD AND SAND sends up BLOOD AND SAND, a torrid bullfighting melodrama starring Rudolph Valentino. In this version, Stan Laurel is the matador, a dashing if clumsy fighter named Rhubarb Vaseline. With seduction, elaborate costuming, dancing and a climactic bullfight, MUD AND SAND mines the trappings of movie spectaculars for farce. Playing against type, Laurel thrives relating the ballet of bullfighting to that of slapstick comedy. The ether-laced finale verges on the surreal.