"Frankenstein Meets the Wolf Man" was in a class by itself according to Denis Gifford in his "A Pictorial History of Horror Movies," Hamlyn, New York, page 141:
"Frankenstein Meets the Wolf Man" (1942) was conceived as a battle of the giants! The idea was vintage Laemmle: instead of teaming stars, team monsters. But Universal had set themselves a problem: both the Frankenstein Monster and the Wolf Man had last been played by the same actor, Lon Chaney. Chaney would let no one else play his Baby, so who to cast for the Monster? The problem was soon solved. Lugosi's part in the saga, Ygor, was now dead, his brain in the Monster's head, his voice in the Monster's mouth. What more natural than have Lugosi play the Monster? If he was still recognizable under [John] Pierce's makeup then that was simply Ygor showing through! Besides, there was an element of destiny that the fans would not have forgotten. Lugosi had rejected the original role twelve years earlier. Lugosi could no longer afford to be so choosy. He brought tot the Monster his own curious interpretation, a hissing evil that snarled through the makeup. His stretch-armed strutting seems senseless in context, yet was not so in shooting. For as filmed Lugosi's Monster is blind as a bat. [They goofed in giving Ygor's brain to the Monster. They had different blood types that damaged the Monster's optic nerves. Miss Maven couldn't make this up!] Pre-release shortening by the studio removed the reason for Lugosi's climatic close-upped smile: Patrick Knowles has not only restored the Monster's strength, but his sight, too!
There's a fun goof to catch during the fight between the Wolf Man and the Monster at the end of the movie.
Watch carefully when the Wolf Man gets up on the big piece of laboratory machinery and jumps the Monster below. You'll see fine wires pulling the machinery forward as Lon Chaney jumps!
That reminds Maven of what the Internet Movie Database (www.imdb.com) has to say about "Frankenstein Meets the Wolf Man":
During Larry Talbot's first transformation into the Wolf Man, he goes from wearing light-colored night clothes to a dark shir and pants. When he awakens the next morning, he's back wearing the pajamas.
When Franenstein's Monster is first reveled behind the ice wall, his face is completely different than when he is shown walking with Talbot in the next scene. This is due to a different actor playing the role during the first sequence . . . .
When the monster is being recharged in Dr. Frankenstein's laboratory by Dr. Kettering, he is clearly enunciating the words, "Thank you, Dr. Kettering!" The line was deleted from the final film.