- Boris Karloff was to star as Dr. X.
- Humphrey Bogart said of this film: "This is one of the pictures that made me march in to Jack Warner and ask for more money again. You can't believe what this one was like. I had a part that somebody like Bela Lugosi or Boris Karloff should have played. I was this doctor, brought back to life, and the only thing that nourished this poor bastard was blood. If it had been Jack Warner's blood, or Harry's, or Pop's, maybe I wouldn't have minded as much. The trouble was, they were drinking mine and I was making this stinking movie."
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