- Executive Meddling: All the references to The Ghost of Frankenstein were cut, which shortened The Monster's appearances on-screen drastically.
- The Other Darrin: Bela Lugosi replaces Lon Chaney Jr. as the Monster. In addition, Elsa Frankenstein from The Ghost of Frankenstein, is played by a different actress.
- What Could Have Been: Along with the deletion of Lugosi's lines as the Monster, Lon Chaney Jr., was originally set to play both monsters, but this was dropped.
- You Look Familiar:
- Dwight Frye and Lionel Atwill, who'd appeared in several earlier Frankenstein films as different characters, show up yet again here. Ditto Patric Knowles, who was Frank Andrews in the first Wolf Man film and plays Dr. Mannering here.
- Not to mention that Bela Lugosi had played Ygor in Son of Frankenstein and The Ghost of Frankenstein, as well as Bela the gypsy in The Wolf Man (1941). Or that Lon Chaney, Jr. had played the Monster in Ghost.
Trivia / Frankenstein Meets the Wolf Man