Revealing mistake: When Tango and Cash are getting attacked down the laundry chute, they are tied up above a water tank with a guy holding an electric wire. Their hands are tied to dry cloth which is then tied to the cable. Cloth has no conductivity so there is no complete circuit when their feet are lowered into the water so they wouldn't be getting shocked. The reason they wouldn't be getting shocked is actually explained later in the movie just before they slide down the electric wire.
Continuity mistake: Tango and Cash play good cop, bad cop with the bad guy on the roof of the building by taping a grenade to his mouth and intimidate him by threatening to pull the pin. They get the information that they need out of him. Cash says "We scared him so bad, he is standing in a puddle and it's not raining". They then take the grenade, pull the pin and stuff it down his trousers. The next shot is the grenade coming out his trouser leg onto the ground where there is no puddle to be found.
Factual error: When Stallone shoots the tanker to show that it's being used to transport cocaine, he's apparently stumbled onto the only drug dealers who don't ship cocaine in bricks. There is no way that the coke would flow out of the bullethole like that.
Continuity mistake: During the brawl in the prison boiler room, Tango hits one of the cons with the hatch of one of the boilers. Tango holds onto the boiler in one shot but not in the next.
Continuity mistake: When you see Conan on the surveillance screen inside the prison, screaming, "Bring them to me!" his hands are at pretty much shoulder level on the bars. But, in the very next shot of him, his hands are much lower on the bars, not even in the shot.
Other mistake: After Tango and Cash go down the chute and into the boiler room, Conan approaches them and says, "On the road, this pig and his cop friends broke my ribs, my leg, and my jaw" without an accent. All of the other lines that he had before, he had a Mexican accent. It also seems like all of his other lines after that point are said without an accent as well.
Other mistake: When Cash runs for the wire when escaping the prison in the long shots the stunt man's hair isn't plastered down with the rain and also where was Kurt Russell is wearing a muscle vest his stuntman is wearing a t shirt with sleeves.
Continuity mistake: When Tango & Cash are standing on top of the building, getting ready to run and slide down the wire, the type of t-shirt Cash is wearing keeps changing. It switches between a sleeveless shirt (when shown from the front) and short sleeves shirt (when shown from the back).
Answer: He was doing a combat reload, where you eject all the rounds, spent or not and fill the revolver with new ones. It guarantees six shots, rather than relying on "indexing" where you count every round fired.
stiiggy
That doesn't make any sense since he hadn't fired a single round and the gun was fully loaded.
It's hard to tell, but it does look like there were at least some empty shells that land on the ground. A revolver isn't going to eject spent shells, so there's no way to say it was fully loaded.
Bishop73