I've read stuff that says your brain is actually pretty poor at remembering stuff so as a defence mechanism will just go with the flow in the hope you don't notice. So if your talking to someone who has a seemingly strong recollection of an event your brain will not want to get caught out and assume it was accurate. Also someone told me that when you recall an incident you then resave it back into your brain so overtime the memory becomes fragmented or corrupted as opposed to having a read only recollection of an event.
The brain is the master at filling gaps in your memory with useless, unrelatable shit. It only takes you to second guess a part of your own recount once, or a leading question or statement to completely change your recollection. Once that happens, you can essentially be convinced to ‘misremember’ the ‘facts’ of what you saw.
There are some brilliant eye witness testimony experiments and case examples which highlight how poor our detailed memory is. Well worth a dig through.