Continuity mistake: When the villains get the last of the plutonium out of the cache, we see one villain shoot the chain suspending a concrete cap; causing it to fall and close the hole. A short time later, we see Maggie exclaim that the plutonium is gone. The cap could not have been lifted because all the miners were taken away, yet the cap is gone and we can see into the cache.
Continuity mistake: At the end, the number on the helicopter is 711. As it takes off it is 712. (01:26:30)
Continuity mistake: When the villain has the gun to Billy's head, in one shot it's touching his head, in the next he is about 1-2 feet away. (00:33:45)
Character mistake: In the bar scene, Gunner asks Barney Ross for a pen to write an equation on the piece of tissue. He said that the equation was Einstein's theory of special relativity, but it's actually Einstein's equation for general relativity.
Factual error: As the guys zipline down the electric cables, they continue past every pylon without a problem. Cables are connected to pylons, so the connections to the zipline couldn't move past pylons freely. (00:08:10)
Continuity mistake: In the opening chase with the seaplane the fuselage changes shape from being pointed at the tail end to being square to load the jet skies and as they crash through the exploding bridge to being pointed again.
Plot hole: The seaplane should have a watertight hull so the two jumping out the bottom makes no sense when they should have used the same exit at the rear of the plane that they loaded the jet skies with.
Continuity mistake: In the scene when the bad guy drives through the front of the airport, he crashes into a pillar. The truck stops flush with the pillar. In the very next shot it is a foot or so away from the pillar.
Continuity mistake: When the door gets blown in the room where Arnold Schwarzenegger (with a bag over his head) was strapped to a chair, Arnold and the chair fall down. From the shot behind him, you can see his right hand gets freed. Moments later when they help him back up, both his hands are strapped again. (00:06:00)
Factual error: In the opening sequence, there's a bit where they lower a door/ramp at the back of the plane to load jetskis onto it. They only show the door opened from inside the plane, probably because looking at it from outside, the actual plane tapers off towards the end, and doesn't have space for a large access ramp like that. (00:12:15)
Continuity mistake: At the beginning of the movie, Dolph Lundgren throws down the battering ram which has "Knock Knock" written on it. Shortly after one of their vehicles reaches the top of the ramp and one of the enemy jeeps falls off the roof Jet Li screams "Shut up, Gunner!" at Dolph Lundgren. Just before he screams, the "Knock Knock" battering ram is back in the retracted position. A few seconds later, it is facing the front again. (00:03:50)
Continuity mistake: When the men are being attacked after spending the night in the abandoned town, the horde of people attacking them are all in dark colors such as gray and black. If you watch carefully, you will notice one man in white attacking. This man is shot down and dies, but a few seconds later he is alive and attacking still.
Continuity mistake: At the beginning, when the Expendables and Trench are leaving the interrogation room, we see Jet Li along with his main weapon leaving with them, but in the next shot, he picks up his weapon and leaves the kitchen.
Continuity mistake: Just after Billy dies, Barney says "let's take care of him" and Toll Road puts his cap on. In the very next shot as they walk away Toll Road's cap has disappeared.
Continuity mistake: When the bad guy's convoy is coming towards them, the good guys shoot a hole in the front of the truck right under the windshield. Once the bad guys crash the truck, the bullet hole is gone.
Continuity mistake: In the bar Gunner writes down Einstein's theory on a napkin. He writes it near the top on the napkin, in the very next shot it is closer to the middle of the napkin and the hand writing changes.
Continuity mistake: When Church gives Barney the piece of paper, the way Barney holds it changes between shots. (00:22:10)
Continuity mistake: When Barney leaves the bar the number plate on his bike is on the left, in the next shot it's on the right. (00:19:10)
Revealing mistake: When the plane goes through the smoke at the start, the smoke doesn't react in any way - it keeps rising. Surely the wind from the plane would make the smoke drift a different way. (00:12:25)
Revealing mistake: Just the bridge is blown up at the start, you can see all the soldiers have been replaced by dummies. (00:12:10)
Answer: "We keep it light" refers to their mood. They joke around and tease each other and have fun. "Till we go dark" is when they get serious for killing. "We go pitch black." Meaning as dark and brutal killing machines as possible.
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