Factual error: In the medicine cabinet, when Margaret is emptying it, a box of Rite-Aid Bandages is visible. Rite-Aid is an American chain of drug stores, not in the UK. And the Brits call the product plasters.
Factual error: Josh abseils forwards into the cave and in the next shot is seen coming alongside Victoria, in the standard seated abseil position. This would not have been possible, due to the design of his harness, without moving his abseil device from his back to his front. This would have involved him removing the device completely and then re-attaching it to the front of his harness which would be impossible during descent. (00:15:20)
Factual error: Lady Arabella mentions her ex having put their "private" tape on Youtube. Impossible as Youtube strictly forbids that sort of thing from being uploaded on their site.
Factual error: Throughout the film's high-energy choreographed fight sequences, Rama is repeatedly struck in the arms, legs and back with machetes. He not only suffers no wounds, but his tactical gear isn't even lacerated.
Suggested correction: Depending on what part of town his gear, the angle and strength of the blow, and how sharp the machete is, there may have only been negligible cuts. Apparently loose fitting clothes can sometimes be enough to keep a blade from cutting some of the time.
Rama's gear doesn't show even minimal lacerations or abrasions after multiple attacks.
Factual error: Colonel Meyer's promotions are listed in his SS ID card as Hauptmann, Oberstleutnant and Oberst. Since the SS used a different ranking system from the Wehrmacht, they should actually be Hauptsturmführer, Obersturmbannführer and Standartenführer.
Factual error: In his crude attempt to replicate the Human Centipede surgical procedure, Martin employs several handyman tools, including a carpenter's staple gun (using T50 staples as sutures). Problem is, carpenter's staples would never join soft human body tissues, they'd pull right out with little effort (T50 staples only join to very solid base materials, such as wood). Martin's victims, hysterical as they were, could have freed themselves from the T50 staples almost immediately.
Factual error: The guys are trying to find a seedy bar and are using the GPS with Gregory talking to them. The map shows them moving in one direction but the streets are diagonal from where they are going.
Factual error: When Mitch Albom is with Rabbi Albert Lewis in his rabbinical office/study they discuss an empty folder on the rabbi's bookcase labeled "God". Religious Jews as this rabbi was, know not to spell out the deity's name, but write it as "G-d" instead.
Factual error: When D'artagnan and the musketeers are infiltrating the Tower of London, the king's guards are seen with the Tudor Rose crest on their tunics. By the time stated at the beginning of the movie, the last Tudor monarch (Elizabeth I) had been dead for 80+ years.