Ivan the Terrible's tomb is shown as an isolated castle in northern Siberia. In reality, the Russian ruler's remains are buried in the Cathedral of the Archangel Michael near the center of Moscow.
Vlad Tepes is buried in the Snagov Monastery, located on a small river island near Bucharest, and not in Transylvania as depicted in the show.
Napoleon's body is nested inside several coffins, one inside the other, included one sealed with lead. When Tomax and Xamot open Napoleon's crypt, the body is shown laying open with no additional coffins.
Iceberg is black when Duke tells him he was born in the wrong home town, but when Duke tells Hawk about his frozen hot coco, Iceberg is briefly seen as a white man.