A forensic psychologist spoke on this at the inquest: (also spoke about FM and the two cars):
The expert was also questioned about Ronald Chapman’s account of seeing
William dressed in a Spider-Man suit being driven past his home on 12 September.
The Kendall resident told the inquest in March 2020 that
he was “sure” the boy he saw in the back of a Toyota LandCruiser was William.
Paterson said Chapman’s retelling of the memory changed over time, with an initial mention of a cape not appearing later and the latter accounts told with more confidence and accuracy about key events.
The memory expert said it could be the case Chapman was incorporating “post-event information”, such as news reports, in his memory reconstruction. She said her evidence assumed Chapman and the foster mother were giving accounts in good faith.
“There are ways that people can report information that is not true but they are not lying,” Paterson said.
William Tyrrell's foster mother could have created false memory about parked cars, inquest told