The Expendables 2

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.

loserlearner

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.

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Barney Ross: Why is it the ones who deserve to live, that want to live the most, die - and the ones that don't deserve to live, keep on going?

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Trivia: Booker is a nod to "Good Guys Wear Black" in which Chuck Norris portrayed a character named John T. Booker. In both films Norris plays a retired military operative in a rescue mission to help his old comrades.

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Question: What is the thing that the five guys are saying in the plane before they make a toast to Billy?

Answer: The words of their chant are "Beware, beware, walk with care. Careful what you do. Or Mumbo Jumbo's gonna hoo-doo you. Mumbo Jumbo's gonna hoo-doo you. Boomlay, boomlay, boomlay, boom!" This comes directly from a poem titled "The Congo" by poet Nicholas Vachel Lindsay ("The Congo and Other Poems"), specifically the lines at the end of part I.

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