When Peter Skellen arrives home in his car with gifts for his wife and child, the child's present is clearly a box shape however once inside the house its clearly a wrapped present.
The US Army officer Captain Hagen is from the Army Ranger regiment but he is wearing the old WWII diamond patch, instead of the scroll that was worn in 1982. Also the rangers of the period were airborne, Hagen does not wear jump wings, nor does he wear the black beret or bloused jump boot with his class A uniform.
General Ira Potter (Robert Webber) is supposed to be the Commander-in-Chief of Strategic Air Command, however on his white mess dress uniform he wears no pilot's wings. Few, if any members of the United States Air Force advance to General officer rank unless they are experienced flying officers.
The television newsreader refers to "London Airport". London has had two airports (Heathrow and Gatwick) since 1958. Whilst colloquially Heathrow is sometimes referred to as "London Airport" because it is the closer one to central London, a news report would be more precise.
When the female terrorist was shot by the SAS, she was thrown backwards by the bullets and strikes a wall. You can clearly see the stunt cable coming out of that wall that was attached to her.
Peter Skellen was a member of the Armed Forces and had only been separated from his family for a couple of weeks which is nothing to the separation normally endured so meeting up with his wife because he missed her thus blowing his cover was ridiculous.