When the bad guy tosses the gas bomb into the utility room, it is a heavy-walled smooth-surfaced metal canister with a rounded end that rolls away from the seam in the concrete floor. Yet in the next shot of the bomb just before it explodes, it is a crudely-shaped flat-ended cylinder wrapped in wrinkled metal foil, and is sitting right on the crack in the floor.
Jaime takes a sheaf of about six envelopes and lays them in a stack to start addressing them, yet in the next shot there is just a single envelope in front of her, and she takes individual blank envelopes one-by-one from off-camera as she addresses them.
In the climatic scene when the final assassination attempt occurs, Oscar enters the room with his gun drawn, he then places the gun into his belt line as he turns to approach Jamie, then in the next scene his gun is still drawn and he puts it into his belt line again.
The surrounding scenery changes between wide-angle and closeup shots of the foreign president's black limousine.
The mercs were still in the room with the King while he was being fitted with the jacket, so they would not have had the wardrobe-bomb's timer set for just the few seconds that it took Jaime to yank the jacket of of the King and fling it out the window, since they themselves would have gotten blown up along with the King if the bomb had gone off inside the room as they'd apparently intended.
If everything that was to be used for the King's visit would be inspected before it would be allowed near the King, then the camera would be searched, also, and the suspiciously-empty film chamber with the unnecessary-for-photography metal gun-holding brackets inside it would have been discovered, even if the gun itself was not presently mounted inside the brackets.