Shot at Quality Studios, an isolated single soundstage at 5628½ Santa Monica Blvd. in Hollywood. Its entrance was between The Harvey Hotel and The Gold Diggers (a bar). Edward D. Wood Jr. shot Plan 9 from Outer Space (1957) there. Its connection with Wood has led to efforts to restore and preserve the structure.
George Weiss had Rita Martínez affect a thick Mexican accent because her real voice was "too American."
The character Umberto Scalli boldly returns from 1949's The Devil's Sleep. Making this movie a sequel. When being deposed, the investigator even seems to refer to Scalli's history in that previous move. Scalli, apparently something of a one trick pony, sets up a similar operation.
Final film of Muriel Gardner.