This show is practically built on this trope. Do not try holding a drinking game.
- In "Army Of God" Gillian and Dolly claim the Knights Templar had been suppressed by the Church (along with French King Philip IV) for being troublesome religious fanatics who (it's implied) advocated poverty too much for the elite's liking. However, this is far from the truth. While the Templars were sworn to poverty officially, like monastic orders generally, over time the Order acquired massive wealth due to charitable donations, noblemen joining them placing their assets in the Order's trust, them accepting fees for protecting Christian pilgrims' property while in the Holy Land, and being entirely tax exempt. The Templars grew into bankers, inventing highly innovative financial techniques and establishing what some have described as the first multinational corporation. Over time, they also acquired large tracts of land across Europe, not only churches and castles for Templar soldiers, but also fields or vineyards. As their power grew, so did distrust. Philip in fact took advantage of this because he was deeply in debt after taking out loans from the Order. He pressured Pope Clement V, who dissolved the Order after many of the Templars were arrested, then tried on charges of blasphemy, sodomy and fraudulent financial dealings (which most historians regard as wholly trumped up). So the motive in fact stemmed from the opposite of what they said here.
- In "Warriors" the characters find a slave ship that is dated about a decade after slavery was really outlawed in the British Empire.
- "Warriors" also invented a group of Great Dismal Swamp Maroons (i.e. black people descended from escaped slaves in North Carolina/Virginia) who sided with the Americans to fight at the Battle of Yorktown, led by a fictional leader named Oban. The Maroons stayed in the swamps except for occasional raids, and none sided with the Americans. Also, the Battle of Yorktown was also a siege rather than open combat as is portrayed.
- In "Cradle Of Civilization" Magwilde claims that 4000 years ago Egyptians and Greeks were much more advanced than the people in the UK who were doing nothing but "picking their teeth." They completely failed to mention that one of the oldest known human settlements, Skara Brae, was built off the coast of Northern Scotland, is still yet standing and they had a working drainage system.
- Magwilde dismisses Stonehenge as just a bunch of rocks and ultimately unimpressive compared to things like the pyramids or Petra. Stonehenge is the center of a huge complex that was one of the absolute greatest technical accomplishments of its era and and the stones themselves were likely a gigantic functional lithophone.
- The entire Boudica episode is based around the idea that the Romans really captured her alive, but spread the story of her suicide to discredit her. Even leaving aside how utterly pointless this is, both the Iceni and the Romans considered a defeated leader committing suicide to be an honorable death and being captured alive the ultimate humiliation (especially as they would have publicly displayed her in a "triumph" within Rome before a cruel public execution).
