Part of the movie was shot during the middle of a real hurricane --- the wind and snow seen during the final scenes is not artificial. The exterior chase that ends the film was filmed at the Old Mill on a Jamaica Bay estuary on Long Island during Hurricane Donna (September 10-12, 1960), the only hurricane of the 20th Century to strike the entire East Coast from south Florida to Maine.
Allen Baron originally offered the role of Frank Bono to Peter Falk as a friend for no pay. Falk seriously considered it, but declined when he was offered a paying gig in Murder, Inc. (1960).
Blast of Silence (1961) was shot on a budget of just over $20,000, using footage from various screen tests to keep the costs down.
Lionel Stander, uncredited as the Narrator, is well-known for his introductory narration on Hart to Hart (1979), where he played Max and introduced the stars, Robert Wagner and Stefanie Powers. He was paid only $500 for his work on this film according to TCM's Eddie Muller.
Many of director Allen Baron's friends and family appear in secondary and background roles - unpaid.