Americans get very heated about this Berenstain Bears thing, but we didn’t have it here. Plus I doubt many think Mandela died in the 80s as we aren’t completely ignorant and have closer ties to South Africa (I suppose).
All of the examples I have seen are just fuzzy minds or false assumptions. I do like the idea that you can pin down which timeline you are in by how you remember the name of a TV show, or the last lyric to a song, or if Pikachu had a black end to his tail or not.