Memory is fascinating. As are false memories.
There was a thread about the claimed walkers colour change a few years ago which was amazing as so many people reported remembering it happen very specifically. The problem being the 'memories spanned' about 20 years! Some people had specific memories of talking about it in school and they were in primary so must've been 1985 or so, from other people remembering it happening when they were at uni in the mid-90s, others remembered it happening and they talked about it in the pub around 2002. Everybody claimed to have a very specific memory of it.
I thought I remembered it happening in the 80s when I was at primary school and it being headline news in the tabloids. All made up by my brain.
It didn't happen at all, let alone it being announced in the newspapers.
Memories aren't really memories, they're reconstructions of things and easily influenced.
So people read 'remember when walkers changed colours' and think yeah, I remember that, it was when I.... and conflate different things that did or simply did not happen.
You can show them old crisp packets from years before they claimed they remembered the colour change and instead of admitting they must be wrong, they say walkers must be lying or there's some kind of glitch in the matrix or 'the mandela effect'.
Same for all the people that remember seeing the plane hit the first tower live on TV on 9/11 in 2001. Didn't happen. News reports started after the 1st tower had been hit and so many people saw the 2nd tower being hit live on TV.
The footage of the 1st tower being hit that everyone claimed to remember seeing live was shot by a documentary film-maker Jules Naudet who was making a docu about the NY fire dept and just happened to be there to film the 1st tower being hit but that wasn't aired on TV till 2002.