THIS WEEK
Newly restored print of 1921 film Nosferatu to be shown at Walter Reade Theater to mark Halloween; Prof Harold Bloom to make acting debut with American Repertory Theater leading reading celebrating Shakespeare's Falstaff, Cambridge, Mass; 66 old master drawings on loan from British royal family library to be on view at Getty Museum, Los Angeles, in show focused on Raphael; International Toy Theater Festival is set to open; photos (M)