Continuity mistake: When Miss Daisy talks to Boolie about Hoke's alleged theft you see bright daylight outside, also in the scene before when Boolie has breakfast. In all shots taken outside Miss Daisy's home it is dark and foggy. (00:31:40)
Factual error: While driving Miss Daisy across Alabama, mountains are seen to the north as the car moves across the screen from left to right. This would mean that they were headed east or back to Georgia and not south and west to Mobile, Alabama.
Other mistake: Regarding the power outage during the ice storm, correct that the gas stove would have been fine, except they may have had an electric percolator. But unlikely the phone would have worked, no power for the ringer.
Suggested correction: It depends. Most landline phones work during a power outage, with the exception of cordless phones because they don't require power from the home (which is why you don't plug them into an outlet). The small amount of electricity is provided by the phone company. So unless the phone company providing power lost power, the landline would still work. I didn't see anything that indicated that happened.