Movie Madness (1951)

The talking magpies, Heckel and Jeckle, crash a movie studio driving a papier-mache limousine, and have no problem eluding the studio watchdog by disguising themselves, at various times, as knights-in-armor, Romeo and Juliet and, then, a couple of penguins. After many defeats, the vigilant-but-dumb bulldog finally kicks them of the lot.