Goofs

At about 19:30 when the saloon fight starts, the sergeant is hit on the head, knocking off his cap. He immediately turns to the colonel to speak and the cap is back on his head.

During the attack at the bandits' village, Baker (Dean Martin) starts shooting with the Gatling gun. The moment he starts shooting, the magazine falls from the gun but the gun keeps firing. The next moment the magazine is on 5he gun again. The same thing happens once more, as Baker shoots the bandits on the church's' s roof. The magazine falls from the gun, the gun keeps firing and the magazine is on the gun again.

The gun runner says he took the gun from Tucumcari. There was no city of Tucumcari until 1901. There was a mesa referred to as Tucumcari Mountain, but the nearest settlement was called Ragtown.

[ at about 26 minutes into the movie ] When Tommy McBride is supposed to be playing the bagpipes, his blowing into the bagpipes does not match the music coming out, at all! Music comes out in between his breaths, when he is not blowing.

Yes and the whole point of the bag-pipes is that the bag provides a reservoir so there's always air available and the piper doesn't have to breathe in time to the music.