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The story based the film's four detectives on the real life LAPD foursome known as the Hat Squad. As portrayed in the film, the LAPD leadership empowered them and the larger "Gangster Squad", subsequently renamed the "Intelligence Division", to specifically interdict the movement of East Coast organized crime into Los Angeles. The actual LAPD units allegedly used tactics commensurate with the level necessary to counter and repulse organized crime groups.

When Hoover and his men are caught trespassing by Colonel Fitzgerald and the MP's, there is an offstage ADR line heard as one of the men speak on the radio, "Sierra, Tango, Zero, One." "Sierra, Tango" is the phonetic alphabet representing the letters "S" and "T". However, this is the current phonetic alphabet which became effective in 1957. The ADR line should have read, "Sugar, Tare, Zero, One" to be authentic to the period.

Featured in Siskel & Ebert & the Movies: Celtic Pride/Mystery Science Theater 3000: The Movie/Mrs. Winterbourne/The Substitute/Fear/Sweet Nothing (1996)