When my son was small, a yankee family had moved into town and had a son in the same kindergarden. The mother almost had a stroke when her son was reciting his alphabet and she heard him saying "are-a" for "R".
And yes, "coke" is usually the generic term for anything containing flavoring and carbonated water in a sealed container. Many people in the area where I grew up always referred to them as "soda water".
In regards to Louisiana - the reason they have such large doghouses (even when they only have a chihuahua) is because in Louisiana "FIDO" is spelled "PHIDEAUX". It's also the land where mathematicians learn that "pie are round, not square".