Factual error: This is one of two episodes in the series where a WW2-era German MP38/40 submachine gun was used by American forces (Master Sergeant Jiggs, in this episode) rather than an American weapon such as a Thompson submachine gun.
Other mistake: Usually Master Sergeant Jiggs and his men are posted as guards in the Time Tunnel control room at all times, but when Merlin shows up in the control room a second time, there are no guards to be seen.
Continuity mistake: Jiggs goes back with a bag of grenades and a machine gun. He fires the gun, but when he is jumped on by the Trojan, the bag is gone. An object which may be a bag is lying on the ground, but is not the one he brought. No further mention is made of the grenades. (00:21:20)
