Other mistake: Captain Willard inquires from two soldiers manning a machine gun, "Who's the commanding officer here?" The two can't kill the enemies "out there by the wire" so they ask their friend "Roach" for some help. As "Roach" walks over he turns off a tape recorder playing some Jimmy Hendrix riffs. If you look closely at the buttons of the tape recorder, it was never on in the first place. (01:45:50)
Other mistake: The scene where the British army is crossing the Buffalo River is in the historic place but they are crossing in the wrong direction.
Other mistake: The chandelier falls at the crystal ballroom and Wally drops. You can see he's nowhere near it but he still falls down.