"The man... and the motion picture that simply do not conform."
Cool Hand Luke - Easter Eggs & Hidden Details
Easter Eggs
Luke's Prisoner Number 37
References the Bible verse Luke 1:37: "For with God nothing shall be impossible." This reinforces the Christ-figure allegory and foreshadows his impossible feats (like the egg eating).
Violation
When Luke cuts the heads off the parking meters in the opening scene, the word "VIOLATION" appears on the meter. This sets the theme for his entire existence: a violation of social order.
The Final Cross
In the final overhead zoom-out shot, the intersecting roads form the shape of a cross, and the torn photograph of Luke is superimposed over it, completing the visual canonization of Luke as a martyr.
Green-on-Top Traffic Light
In the ambulance scene, the traffic light shows green on top. While potentially a goof, it mirrors the famous upside-down light in Syracuse's Tipperary Hill, a symbol of Irish rebellion against British (Red) authority.