This is a list of common, uncontroversial, and undisputed misconceptions.
List of misconceptions
Some believe that the ship Mary Celeste was called Marie Celeste. In fact Marie Celeste was the spelling used by Arthur Conan Doyle in a story based on the incident.
Some believe that the famous line "play it again Sam" was spoken in Casablanca. In fact, the line in question is: "You played it for her, you can play it for me. Play it!".
Some believe that Christopher Columbus had a hard time receiving support because Europeans believed in a flat Earth. In fact, sailors and navigators of the time knew that the Earth was spherical, but (correctly) disagreed with Colombus's estimates of the distance to the Indies.