Interesting. So theoretically you could still find traces of a thing as it used to be by looking for it's footprint and then checking things that referenced it.

The above cornucopia pic would be a good example.

Perhaps there is a song with Berenstain Bears in it, where the word itself is changed (post Mandela) when it is sung, but the song rhymes with Berenstein, not Berenstain.

Everyone remembering Luke I am your father would be written off. However, you can still find video of people saying it. What year did people start saying, "No, I am your father." If there was legitimate confusion, then there should be a comparable number of quotes going all the way back to the release of "Empire".

Another example is the line "I see white people" from Scary Movie. It is now, "I see dead people". The footprint is that "I see dead people" is really kind of awkward. It arguably doesn't fit with the humor of the scene.