Factual error: Abraham and Palmer visit what they describe as a nunnery. However, it is full of men and boys dressed as monks with not a woman in sight, although one novice does refer to the Mother Superior. No Roman Catholic monastery is mixed sex.
Factual error: In the 1960s Abraham says someone went to Belarus. The Soviet Republic (and the region in general) wasn't called Belarus in the 1960s and was never referred to as that; it was Byelorussia or White Russia until 1991.