Gerald Baxter asks John Porter 'Which winner of the Nobel Prize for Literature also played in the World Cup?' and Porter answers Albert Camus. Camus did play as a goalkeeper for a local team in Algeria until he was 17 (he contracted TB), but never at an international level.
When Danni hands the results of Steve's autopsy to Layla, the listing of team members from the 'internal SAS inquiry into the Bratton extraction' can be seen as having "Sgt. H. Collinson" highlighted. According to the briefing on the eve of the fateful Basra mission (in Ep. 1), Collinson was a Captain back then.
While John and Gerald are traversing on foot between Afghanistan and Pakistan, the sound effects include rattlesnakes. Unfortunately all species of rattlesnakes can only be found in the Americas, unless of course the storyline gets modified to make them the CIAs new secret weapon.