[2] Six Bridges to Cross is based upon the famous 1950 Great Brink's Robbery of Boston, Massachusetts in which the thieves made off with roughly $2.5 million.

It is only after he and his gang pull off the heist that Florea reconsiders his actions and attempts to make amends for the crime.

The screenplay for the film was written by Sydney Boehm, based on Joseph F. Dinneen's They Stole $25,000,000 – And Got Away with It.

Mineo had also successfully auditioned for a part in The Private War of Major Benson as a cadet colonel opposite Charlton Heston.

[9] Sammy Davis Jr. was hired to sing the title track written by friend Jeff Chandler and Henry Mancini, recording it on December 2, 1954.