When Bugs Bunny enters the abandoned mansion, he quips "Sounds like 'Inner Sanctum!'" "Inner Sanctum," a popular radio horror show at the time, opened with a creaking door and eerie background music.
On the back side of the 'Hotel Friz' sign is a sign with 'Smoke Krools' - probably a take-off of 'Kool' cigarettes.
Although this cartoon features caricatures of Edward G. Robinson (Rocky) and Peter Lorre (Hugo) as a gangster pair, the real actors never appeared together on screen.
The exterior of the spooky house looks a bit like the Addams Family mansion with a touch of Psycho thrown in. But neither of these productions would be completed until the 1960's.