Factual error: When Ulysses opens his mouth while speaking, modern dental fillings are in his teeth.
Factual error: The Vikings in this episode are fighting while wearing horned helmets. Contrary to popular belief, Vikings never wore horned helmets in battle. Some theories state the horned helmets were worn during special ceremonies, but never in battle or daily life.
Revealing mistake: When Tony and Doug are captured by the Greeks, the lead Greek soldier points his sword to Troy. The "Troy" shown is a modern still picture of the ruins of the Greek Acropolis and surrounding structures, complete with a modern blue and white vehicle that looks like a bus in the lower left hand part of the picture.
Continuity mistake: At the very end of this episode, when they have just arrived in the new time, Doug is fighting a man in a turban. He loses the turban, but then the next shot, it has reappeared on his head. (00:48:54)
Factual error: When Doug and Tony recount the causes of the Trojan War, they mention three Roman goddesses - Venus, Juno, and Minerva - instead of using their Greek names - Aphrodite, Hera, and Athena.
Continuity mistake: The distance between Ulysses and Epeios goes from distant to close together as the shots change.
Factual error: The battle scenes show the Greek and Trojan cavalry troopers equipped with stirrups on their saddles. The stirrup would not be used until nearly 1,400 years later.
Revealing mistake: After Tony stabs Wogan with the sword, there is no blood on the blade when Tony pulls it out.
Continuity mistake: In the dungeon where Merlin reminds Doug and Tony they are from the future, Arthur's hands instantly move from by his sides to holding the collar of his tunic.
Continuity mistake: When Arthur has the standoff between himself and Doug and Tony, Doug is standing abreast of Tony in the frontal shots and slightly behind him in the views from the rear angles.
Revealing mistake: As Merlin circles the frozen Doug and Tony in the Time Tunnel, Tony blinks.
Audio problem: At one point during Doug and Tony's hand to hand combat with the Union soldiers, the traditional Hollywood sound of a fist smack to the face is heard as Tony blocks a blow with his arm, instead of the sound of a thud.
Continuity mistake: When Tony begins fighting the Union soldier, Tony kicks the soldier's musket out of his hands and it lands to the right. The next overhead shot now shows the musket landed behind the soldier as Tony picks it up to fight another soldier.
Continuity mistake: While Doug is sword fighting with Michaels, Doug knocks off a three-candled candle holder off the table, but the next cut shows it back on the table.
Continuity mistake: When the major hands Doug the musket, Doug is holding it with his right hand, but the next shot shows Doug holding it in front of him with both hands.
Revealing mistake: A modern, mid-20th century concrete bridge/walkway is visible in the background of the Union soldier before he shoots Corporal Perkins.
Revealing mistake: When Doug stops to rest while being chased by the dog, he rests against a thick, heavy tree that wobbles when he leans against it.
Continuity mistake: After falling into the quicksand, Nimon's head and right hand are exposed, but the next shot when Tony and Doug arrive to help, only his head is seen.
Continuity mistake: During Tony and Doug's meeting with Nimon and the Magister, the assistant points his laser gun close to Doug's back, but when the Magister signals to shoot, the assistant is now several paces behind Doug, and there was no time for the assistant to step back.
Continuity mistake: Vokar's assistant brings Tony and Doug into the control room, stopping in front of a dome. The assistant is directly in line with Doug and next to the dome, but the next shot shows the assistant standing further from the dome and towards Doug's left.
