Answer:
John Dean's memory lacked egocentric distortions you see in other people's memory
Explanation:
During his trial, John Dean's memory was considered admirable and surprising because during his testimony, he was able to describe conversations with President Nixon with great precision and a wealth of details. However, as shown in the question above, there were several recordings that showed how these conversations actually took place.
These recordings were the focus of research by several scholars who concluded that only Dean had given a correct statement, his memory was nothing higher than most people's. This is because in his testimony it was possible to perceive egocentric distortions that you see in other people's memories.