A documentary filmmaker sets out to capture the crazy, oppressive lives of a     group of aspiring film executives trying to claw their way up in the industry.   Starting at the very bottom, they are subject to the abuse of a variety of       maniacal producers, agents and studio V.I.P.'s. The ugly side of Tinsel Town   provides plenty of comic fodder in this amusing independent feature.           Michael Wechsler/Terry Keefe---USA---1999---80 mins.