The landing gear that comes down when the Carrier One is landing are those of, first, a 747 and, second, a C1, not those of the DC8 shown on camera.
Aircraft description is wrong. It is not a 747, but a B-52 landing gear shown in first scene and then again when taxiing in.
When he's in his hotel room with Jay and Brooke, Banacek lights his cigar twice, once before he talks on the phone and then again after he hangs up,
When Banacek leaves his car at the airport in Boston, he has a dark brown, soft sided, leather duffel. When he lands in Hangston in the Cessna, he has a reddish, hard sided, leather suitcase.
Crew shadow visible on the Pilots as they walk from the jetliner after it lands at the remote airfield.