There's a few, but as an example, Hersh claims the divers deployed off of an Alta-class minesweeper, which was taking part of the BALTOPS22 excercise.
There was no Alta-class minsweeper taking part in the excercises. And while a similar Oksøy-class minesweeper did take part, it's AIS track doesn't put it in the right spot. When Hersh was challenged on this detail in an interview, he said "It was called the Alta, the ship was there. I mean that is just such a stupid lie." suggesting he meant that the ship was called the Alta, not that it was an Alta-class ship. But the Alta is an Alta-class ship, and also it was in the process of being scrapped at the time, and also wasin't taking part in the excercise.
None of that means that divers didn't deploy off some ship at some point! But Hersh provided very specific details at what ship it was, when it happened, and how it happened, and those details are wrong, which raises the question of what else was wrong. Was it a minsweeper? Was it even actually a Norwegian ship? Was it actually during BALTOPS22? Did the incorrect details come from Hersh or from his source? If the source, was that the source trying to cover their tracks, or did the source, perhaps, not have direct knowledge either, but was just retelling a story they had heard? Etc.