Episode #3.1 - S3-E1
Factual error: In the close-up of the letter accompanying the package sent by DI Richard Poole's parents, their address is from Oadby, Leicester, with a postcode starting by OL9, which is the designation for Oldham, in Lancashire. (00:26:00)
Episode #3.2 - S3-E2
Factual error: When Camille shows the emails to Humphrey, the last one in the list is dated Tue 15/01/2014, which was a Wednesday. It should also be noted that the list does not appear to be sorted by any criteria that would work on Outlook Express. (00:22:00)
Episode #3.3 - S3-E3
Factual error: Reading the dull travel guide, the island of Saint Marie is said to be 1/10 of Guadeloupe (≈162 km), 1/8 of Dominica (≈94 km), 1/6 of Saint Lucia (≈102 km), 1/5 of Martinique (≈225 km) and 1/3 of Barbados (≈146 km). How big IS Saint Marie then? It makes no sense! These very specific fractions (Goodman praises how meticulous the book is) contradict each other. It should also be noted that this fictional book is from 1929 and none of those entities were independent nations. (00:18:25)
Episode #3.6 - S3-E6
Factual error: Humphrey and the rest of the crew arrive on the murder scene, where Fidel is taking pictures of the body. With the knife fully planted inside the victim and pictures still to be taken, Fidel is already able to say that the knife has been wiped clean of prints; it's impossible that he could have already done such an assessment at that point.
Answer: Most likely they had only tropical exotic drinks, he wanted an old fashioned English beer.