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. See more...
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Continuity: 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 whole. 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: When the shootout starts in the airport, the Expendables shoot some bad guys and duck behind a service kiosk. We see Chuck Norris shoot one villain from the second floor behind and above the Expendables. Moments later, when the Expendables advance into the airport, they shoot several bad guys that are on the same level Chuck Norris should be on. Chuck Norris apparently disappeared.