I'm afraid I don't have time right now to link any sources but studies in cognitive and criminal psychology have demonstrated that eyewitness testimony can be easily influenced - a person can be made to believe that they saw something that actually wasn't there. IIRC there was a case study where they showed a group of parents scenes from an amusement park (Disney I think) but had spliced the film with scenes of children meeting Bugs Bunny - who is not a Disney character. Afterward the parents were asked questions about their trip to Disneyland, one of which was if they recall meeting Bugs Bunny there. Many of them said that they did recall meeting Bugs, yet that could not have happened.