As I tried to point out, earlier, there are going to be variations, each time the memory is recalled, but there will even be inaccuracies the first time the event is recalled. Human brains tend to fill in the gaps and they are not typically phonographic. Even police make allowances for variations because it's a well known fact.
Look, as an example, and I swear it is nothing more than showing how imperfect our memories are: when Tracey Martin called the police, the following morning, to report Trayvon missing, the operator asks when the last time he saw Trayvon was. Tracy replies, "Around 8:30 last night." We know for a fact that is wrong because at 8:30 the previous night, his son had already been shot, and the cut through was crawling with police. Is it some mass conspiracy. Did Tracy Martin lie to gain something or he has something to hide? No, he probably came home from dinner at about 8:30 and assumed that his son was home. How can such a blatant inconsistancy happen? Because the human brain fills in gaps and we think we remember more than we actually do.