Factual error: There's an ad for Boddingtons Pub Ale in the phone box as the agent calls his girlfriend from England. Boddingtons Pub Ale was never marketed as such in U.K. or Ireland - it was called Boddingtons Export.
Factual error: In the scene at the Port Angeles Port of Entry, the signage and the uniform patches say U.S. Customs and Border Protection. The interception at Port Angeles happened in 1999 by the U.S. Customs Service. U.S. Customs and Border Protection wasn't created until 2003 due to the events of 9/11. (00:01:55 - 00:02:45)
Factual error: The embassy building itself didn't collapse. The adjacent one did. The embassy itself was deliberately demolished sometime later.
Boys at War - S1-E6
Factual error: As John meets his girlfriend outside her new apartment, a Lexus RX450h drives past in the background. This model wasn't built until 2010.
Boys at War - S1-E6
Factual error: As Walla walks into the house on the day of the USS Cole bombing (10/12/00), he sees a picture of Bin Laden on the wall. That picture wasn't taken until November, 2001. (00:34:20)