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First of eight entries in the "Whistler" series, released from 1944 to 1948, and Richard Dix appeared in all but the last one. Unusually, he played a different character in each.

The signature whistling at the beginning of all The Whistler movies was provided by Dorothy Roberts, backed by the theme's composer Wilbur Hatch and his orchestra.

This film series is based on the radio program "The Whistler" that aired on the CBS radio network from May 16, 1942 until September 22, 1955.

The $10,000 Earl pays for the contract on his own life would equate to over $167,000 in 2022

William Castle says in his autobiography that he made everything possible to put Richard Dix under stress, such as ordering him to give up drinking and smoking and he let him wait long hours between shooting scenes and forced many retakes, to help him enter into his character - with his sense of being haunted.