During the opening scene, as the two guards are walking up to Alcatraz, you can see the San Francisco/Oakland Bay Bridge lit up in the background. Lights weren't added to the suspension cables until 1986.
Both of the police officers that challenge the suspect do not draw their guns. On a stop such as the one shown, they would have drawn their weapons and been in a ready position. Only a master gunfighter could draw and fire to take both of them out before they could fire.