Continuity mistake: As Victoria tends to him, the blood stains on El Tigre's bandages keep changing positions and patterns between shots.
Continuity mistake: Manolito leaves the ranch on a black horse that changes, mid-ride, into his regular brown sorrel, "Macadoo." In later shots of the same ride, the black horse is back, but when Mano dismounts, he's with Macadoo once again.
Continuity mistake: Mano's horse is shot and killed by the Apaches. But when we see a shot of the "dead" animal, it's not Mano's, but the horse Buck was riding (with a distinctive white blaze on its forehead). Apparently, Buck's horse was better at playing dead.
The Kinsman - S1-E20
Continuity mistake: When Manolito rides up to the house, Buck is grooming his horse, Rebel, while standing beside the animal's left flank. After a very brief cut to Mano and back, Buck is suddenly on Rebel's right flank, without enough time to have moved there. (00:34:30)
Continuity mistake: Manolito is bitten on the right ankle by a rattlesnake. But when Maria is later adjusting his bandage, she doctors his left leg instead. (00:01:10 - 00:09:15)
Continuity mistake: While Buck and Mano are chasing the Apaches, Mano's mount changes from a horse with a blond mane and tail to one with an all-brown mane and tail and back again.
Continuity mistake: Sam walks out of the saloon without his gloves on, but emerges into the street wearing them in the very next shot.
Continuity mistake: Blue's arms at the jail cell window instantly switch back and forth from being together to apart to together.