The tattoo of the Fifth Special Forces Group beret flash on Chris's left upper arm depicts the design used during the Vietnam War, but that pattern was not in use during the era when Chris would have been serving in the army.
In the film, when shots strike the prison walls the rounds pass cleanly through as if the walls were nothing more than plasterboard; in reality, prison walls are built from concrete or breeze blocks, which would prevent bullets from penetrating.






