"He can't remember a lot of things, dates, people, places but clearly remembers being in pizza express on a day many years ago."
If you go back over the transcript of the interview there are NOT lots of things that he can't remember. There are things he says didn't happen.
www.bbc.co.uk/news/uk-50449339 Newsnight transcript in full.
To be fair, in the interview, wasn't Virginia Roberts the only person he said he couldn't remember?
He mentioned dates - 10th March then some date in April and, having checked the transcript of the interview, the only date he seemed unsure of was when asked when he last saw Ghislaine, whether it was in the Spring or Summer of this year.
Frankly, he will have been going over and over his diary in light of the accusations since 2015, so I think it acceptable that, once he'd consulted his diary, he remembered the highly unusual Pizza Express visit. Maybe he remembers it because he wasn't going to see his brother, Edward, on his birthday as the PE trip with Beatrice had already been organised?
Looking back at the interview I think EM should have asked him about more about Gislaine considering she had also been acused of being involved with Epstein in procuring young girls. He shold have at least been asked whether she had ever offered or supplied girls or women to provide him with sexual services or even companionship.
Also he should have been asked, not only when he last saw Gislaine but also whether he has any intention of meeting up with her again in the future, whether they are still friends and whether they communicate by other means.