[jacques_chester]

That seems reasonable. I've been in situations where people simply recall events differently, without any sense of intending to deceive.

[DanBC]

This is a really important point that many people are strongly resistant to.

False memory is a thing and many people refuse to accept that it could happen to them.

http://www.bbc.co.uk/news/science-environment-24286258

(There was a radio programme this week that demonstrated the process of giving someone a false memory. I would post a link but First Great Western (the train I'm on) blocks a bunch of BBC website.)