As in the previous episode Invasion, Doug and Tony transfer out wearing period clothes but, in the Tunnel and upon landing, they are dressed in their usual attire.
During the attack on the castle by Robin and his men, the same defender falls off the wall three times - obviously the same stock footage repeated just moments apart.
When Robin Hoods camp is first seen a white plastic bag can be seen in front of the tent.
About two-thirds of the way through this episode, Tony assists Robin Hood and his men in ambushing some of King John's mounted troops. One of the (unnamed) Merry Men launches an arrow that strikes the first of the king's men, who falls off his horse. In the next shot, this archer (to the left of the screen) drops his arrow instead of shooting it.
Ronald Long, who plays Friar Tuck, wears a rather obvious headpiece that makes it appear that he has the tonsured head of a monk.
When Tony and Doug join the Merry Men, Little John says they would be given appropriate clothing of green. Doug's outfit turns out to be tan and blue.
Helping launch a "smoke attack" on the castle, Friar Tuck lights a special arrow with looks like a book of matches. The show is set in 1215 and matches were not invented until 1826.