Continuity mistake: When the bad guys try and kill Antonio Banderas in the bookstore, after killing about the third bad guy, you can clearly see his gun lock on an empty chamber, but there's a cut and he immediately carries on shooting.
Continuity mistake: When El Mariachi breaks the guy's neck at the bar he stands up and his knee caps are full of white dust, then he finishes writing a note to Bucho his knee caps are clean.
Continuity mistake: During the rooftop shootout Banderas reloads his gun (right hand one), than he takes another gun (the one in his belt) with the left hand. After a cut, Banderas reloads his right handed gun again and the left handed gun disappears.
Continuity mistake: When Antonio Banderas and his girlfriend are escaping during one of their big gunfights Antonio jumps off of a building at least three times his height and is covered in dust. When he gets up he is magically clean and unharmed after this fatal drop.
Continuity mistake: When Antonio Banderas is in the gunfight after they check his guitar case, he is trying to get information from Cheech Marin, but he gets shot before he tells him anything. You see Cheech go flying backwards onto the ground, but after the ruckus he is lying face down on the bar.
Continuity mistake: When El Mariachi walks into the Tarasco Bar, it shows a view of the bar and the bartender, Cheech Marin, looks towards the door, and in the next shot the bartender looks over again.
Continuity mistake: When Bucho was smoking his cigar in bed, it goes from small to big and when he puts it on the ash tray, it's small again.
Continuity mistake: The beer in the opening scene with Steve Buscemi regularly goes from halfway down the glass, to practically full again between shots.
Continuity mistake: At the beginning of Desperado, El Mariachi has a flashback to the time when the white-clad druglord Moco shot his hand. There are obviously three mistakes with this scene, although the director tried to tally it with the one at the end of El Mariachi (1992). Firstly, Moco is much plumper in the flashback than he really was in the prequel itself. Secondly, the dead body of Azul, the original guns-in-a-guitar-case murderer, is missing from the ground. And lastly, it's obvious there's no blood on Domino (the dead woman)'s body; only smeared on the ground.
Continuity mistake: When Carolina is removing the bullet from El Mariachi, there is a clock directly behind her. During the surgery, the sound of the clock ticking can be heard, yet the time never changes.
Continuity mistake: During the bar gunfight, Banderas is shown shooting on top of the counter but somehow winding back up in the same place twice.
Continuity mistake: When El Mariachi's friend goes to fire his rocket-launcher (disguised as a guitar case), at first, there is no hole in the case for the rocket to shoot out, yet a shot or two later, the case has completely changed, and now has a large hole in the front for the rocket, a covering flap for the hole and a hole for exhaust in the back.
Continuity mistake: In the bar gunfight scene (where Cheech is the barkeep), Banderas and the bookie from the back room end up on the bar with pistols pointed at each other. Banderas puts his weapon down, then two camera cuts later he puts it down again.
Continuity mistake: When the knife throwing assassin is after El Mariachi, he throws the first knife at his left arm and the second one at his right hand. Then we see El Mariachi going around the corner, with most of his back out of view, as the assassin throws the third knife at him. A few moments later, we see El Mariachi taking the knife out of his back - it's right next to his shoulder, and it was impossible for the assassin to hit it from where he was.
Continuity mistake: Near the end of the film, Antonio Banderas calls his friends and holds the phone in his left hand. The camera cuts to Salma Hayek and then cuts back to Antonio where he is seen to have the phone in his right hand.
Continuity mistake: When the fight breaks out in the bar during the opening song with El Mariachi and his bandmates, he motions for them to join him to break up the fight. After he breaks it up his bandmates reappear on stage like they never left.
Continuity mistake: After Antonio Banderas saves the boy from the truck, they are walking beside a building. The guitar the boy is carrying flips over with every shot change. First, the strings are facing the boy's leg then the guitar back is facing the boy's leg. It changes 4 or 5 times.
Continuity mistake: When the little boy is giving his fathers guitar to the drug runner it has no strings, but when the drug runner gives it to Antonio Banderas it has a string.
Continuity mistake: Antonio Banderas throws his guitar case across the roof, then jumps after it and opens it. From the reverse angle the fake guitar inside is still in place, we then switch to it from from the front and it's instantly raised, with the guns visible instead.
Continuity mistake: When the man sitting next to Tarantino is shot, in one shot there's no blood on Tarantino's face and neck, but in the next shot there is.
Answer: It is called "Pass The Hatchet", and it is written by Ray Theriot, Roger Leon Jr. & Earl Stanley Oropeza. It was performed by Roger & The Gypsies. If you buy the soundtrack CD, it is on there, too.
Deezul