Local color includes distinctive characteristics of a place or time period. Vivid images, as represented in literature or as observed in reality, create specific characteristic traits for a region.
Dialect is the specific language used by people of a certain area, class, or cultural group. The term denotes the particular use of spelling, sounds, grammar, and pronunciation which is uncommon to other groups. It is a very powerful tool for enhancing characterization.
"When I go to Dunkin', I usually get a regulah coffee with cream and sugah.
If you come to Baston, you gottah get the lazy man's Lobstah!
You can take the T right to the Pahk! Don't forget to stop and get some dogs and sausages!