In the opening scene where Bodie and Doyle are handing over a prisoner at an airport, a wall calendar shows the date to be 27 July 1977. However a newspaper containing a report of the bank robbery (which takes place only a day or so later) is dated 23 November 1977.
In the scenes when fighter planes are scrambled to chase Krivas's aeroplane, the fighters change between Harriers and Jaguars and the terrain changes between low-lying and mountainous between one shot and another.
In 'Where the Jungle Ends' there are only six mercenaries in total yet we see that there is one hijacking the plane at the airport and six robbing the bank at the same time.
When Krivas cocks his gun confronting Benny, the slide is locked in the back, indicating an empty magazine. You can see the actor struggling with it. He even aims at Benny with the slide still locked back.
When there are jet fighter planes intercepting a hijacked aircraft, the fighters are equipped with drop tanks. Since the fighters were dispatched on a short range intercept mission, they would not have needed drop tanks, as drop tanks are usually only used for long range missions such as aircraft moving from one base to another.