When Wickings is reading a terminal, the close-ups of the text on the screen don't match with the wider shots of Wickings at the terminal.
During the last battle, a remote model plane is driven into a pickup truck with a mounted gun. The plane clearly passes on the truck's side, and the resulting explosion is early, at the truck's rear.
During the final battle, one shot shows two model airplanes flying toward the enemy. One person flying two planes is nigh-on impossible, especially with only one controller/transmitter.
The morning after Lee and Yogi escape the city, they inspect their bikes. As Lee leans over his bike, which is on its side, and he says to the standing Yogi, "There's a hole in this casing," the boom mic appears briefly, moving over Yogi's head on the left side of the screen.