When Malcolm identifies the new Aurora spy plane, he says it's the "replacement for the S71." He should have said "SR71."
When Malcolm starts the computer of the American spy plane, the spellings are British (e.g., Initialising)
The crashed aircraft was supposed to be a Boeing 747, when Malcolm accesses the building where the fuselage is being decontaminated, the cockpit is not a 747, more like a narrow body aircraft, the size of a Boeing 737.
When Ros and Jo are questioning the MOD guy about the crashed aircraft, Ros mentions the American's "new Tomcats" - but the F-14 Tomcat was retired from active service in 2006, the year before this episode aired.