example: on a dog rescue forum, several people who are in a specialist way well known were asked by the media to comment on a particular dog-related news story. A couple of them were seriously misquoted, yet even with the people who actually said the quotes right there going 'this is not what I said' people were posting 'did you see what X said, I would have thought she would have known better'.

If someone won't believe the media has just made something up when the person about whom it was made up is right there telling you, then I'm not sure what more effective learning technique you could possibly use. Maybe you shut them in a box and zap them with electrodes whenever they show any sign of believing the written word...