When Tennant and Holman went to see 'Boom Boom' Gates at the bomb range, he had twice set off explosives as a demonstration while calling out "Fire in the hole!" only once before each blast. Any bomb technician or disposal team would make that call out three times and face a different direction for each call out before activating the detonator.
When the team arrives at the airport for the final fight, one agent identifies the aircraft as a "small jet", and gives the tail number. The plane they're looking at, and end up boarding, is a twin-prop island-hopper.