Irene Ryan had a long show biz career before she landed the role of Granny in The Beverly Hillbillies. Here she is in an early publicity photo, using her original name Jessie Irene Noblette. Source.
Not Basil Rathbone, Boris Karloff and Bela Lugosi, but in fact Douglas Walton as Percy Bysshe Shelley, Elsa Lanchester as Mary Wollstonecraft Shelley (and the Bride of Frankenstein), and Gavin Gordon as Lord Byron. Source.