Continuity mistake: When Eddie Murphy is on a duck hunting trip with a bunch of gun lobbyists, the lobbyists are firing their M16 rifles at a bunch of ducks that are flying by. You can clearly see them squeezing the trigger and not a single shell case is coming from the chamber of the gun. Also, when you fire a gun there is usually smoke from the muzzle but in the movie there is no smoke, yet you hear the sound of several guns firing.
Continuity mistake: When the congressmen are playing cards, Johnson is shuffling. The first shot shows three stacks of chips on the table to the right of Johnson. The closeup shot on him shuffling shows the chips are directly under his right arm and hand. This same sequence takes place in the two other shots as well.