The third consecutive Stooges short to reuse footage from Hold That Lion! (1947), in this case the file cabinet scene.
The thrill killer shoots 80 times from same gun.
The 3 tones heard when the 3 bowling balls rolled off the cabinet, hitting the Thrill Killer on the head, comprise the 3-tone identifier for NBC known as the NBC Chimes that date back to at least the early 1930s. This appears in many Three Stooges shorts.