The show transitioned to color based technology.
For the first 159 episodes The Andy Griffith Show was black and white. Finally the show transitioned to color, finishing out the last 90 episodes with the advancement.
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Sheriff Taylor never had a gun on his belt.
Apparently Andy Griffith wanted to keep guns away from Sheriff Taylor as much as possible. His reasoning? He wanted the Sheriff to be respected by the townsfolk, not scared because he was armed.