Eric says he only found one Ford F350 in the traffic videos with dual wheels (double set of back wheels), but when he shows them the still of the truck it only has single rear wheels.
During the dance lesson, Hetty explains that the waltz was controversial because it was the first dance where couples faced each other. This is completely wrong.
All dances of the time involved couples facing each other, what they didn't have was touching.
Before the waltz, dance partners only touched hands, usually at a distance. The waltz however involves close body contact, which was seen as very intimate.
When Nell brings up the work rota for the air conditioning company, the employees are listed alphabetically by surname. However, two surnames are the wrong way round, on screen it goes Williams then Walker when it should be Walker then Williams.