When the boys stand up and the bandit at the bar throws the knife into the table it lands straight up and down. When the camera pulls back to captures the 4 boys starting to put the chairs on the table to leave, the knife is at a diagonal angle.
During "What Am I Doing Hanging Round" Peter Tork is playing the banjo, but when the song ends he is holding his bass guitar.
El Diablo enters the bar scene while Davy Jones and Angelita are kissing so passionately that she messes up Davy's hair enough to spike his hair on the top of his head. When the camera angle changes to show El Diablo taking Davy outside, Davy's hair is perfectly combed and not tussled any more. His hair remains perfectly combed also in the next scene as he is shown tied to a tree at the bandit's camp outside of town.
When the boys stop playing, they're suddenly standing in a very different order and Mike is wearing his wool hat, when he wasn't before.
Although El Diablo and Micky Dolenz' showdown takes place at high noon, the church bell peals only 11 times.
Angelita pronounces her own name in the gringo way "Anjelita" rather than the Mexican way which would sound more like "Anhelita" or "Anghelita".