Factual error: A scene takes place in the Rome Casino. In Italy there are only 4 official casinos, none of them in Rome.
Factual error: In the American Embassy scene, when 47 opens his jacket for the security guard, the base plates of the magazines loaded in his Silverballers are marked as .38 Super. The Silverballers, however, should be chambered in .45 ACP. His spare magazines are marked as .45. (00:27:05)
Factual error: At the beginning of the movie when Danny Glover is sitting at the chessboard, the pieces are lined up wrong on both sides of the board. If Danny has the white pieces, the king should be on his right. The black king should be on the opponent's left.
Factual error: Although this 2015 Norwegian disaster film is far superior to the many American disaster movies that it emulates, "The Wave" still suffers the most common error found in tsunami-themed disaster flicks: Crystal-clear flood waters. Of course, tsunami flood waters in particular are always inky-black with churning sediment and debris.
Factual error: During the drone strike, they show MQ-9 Reaper, which is prop-driven, but play a jet engine sound effect.
Factual error: The good guys manage to take over key parts of the prison by homebrewing some chloroform mixing alcohol and bleach in a cute little spray bottle, crawl through the ventilation system and slip in the room a couple dainty squirts. Which instantly knock the guards (one of them with a full face helmet) out. All of this is of course bahooey; chloroform is really volatile and would never make it across the room, and the dosage is absolutely negligible. If the gas were this powerful (which is not) would have KO'd the two agents anyway while they were doing this chemist stunt preparing the gas itself in the tiny broom closet.
Factual error: A library assistant is showing his cellphone to a Fed. The Fed pulls out his gun and shoots the assistant from about 8 inches away into his left temple. Another Fed, standing to the immediate right of the assistant is shown after the shot. But there is no blood or material spray on him at all. His white shirt is immaculate. In fact, there is no blood anywhere.
Factual error: During the opening credits, it is stated that in WW2, German troops gave the US Marines the name of "Devil Dogs." At no time did the Wehrmacht engage the USMC.
Factual error: At the beginning of the movie, the Battle of Scheveveningen (1653) is depicted. However some of the British ships sport a gaff-rigged mizzen spanker, which was not introduced until late in the next century.