Continuity mistake: During the introduction, the snake tries to get away from someone who is supposedly Blackadder. He gets the snake. It's head is above a black tile. There is then a close-up of the snake, Blackadder wags his finger at it. It is now above a white tile.
Continuity mistake: At the very end of the episode, when it shows you all the dead bodies, you can see Queenie to the right for a few seconds. The dagger she is holding is pointing upwards. Then there is a close-up of Queenie, who then talks back to you in Prince Ludwig's voice, and the dagger she is holding is now pointing downwards.
Continuity mistake: When Blackadder, Queenie and Nursey are all comforting Melchett, there is a shot from the side view of Melchett, he is holding his head with his left hand. Then there is a shot from behind Melchett, he still has his hand on his head but when the shot returns to the side, Melchett no longer has his hand on his head.
Revealing mistake: When Percy is holding the 'Green' in his hands, light of the green reflects on the wall behind Blackadder. However the way Percy is holding the 'green' in front of Blackadder, Blackadder's shadow should be on the wall behind him, but it isn't. It's obvious green lighting is used to light up the back wall.
Continuity mistake: There is a knock on the front door, and Blackadder tells Baldrick to 'get the door'. Baldrick returns with it, but the front door on the set, still in place, is still visible in the background of the shot. The fact that Baldrick knows who was at the door indicates that he's got the right one.
Plot hole: The timing in the episode "Head" is completely muddled up. Lady Farrow is shown petitioning the Queen to see her husband and states "My husband dies tomorrow." placing the scene on the Tuesday (Farrow was scheduled to be executed on the Wednesday). In the next scene Percy is asked by Blackadder how the executions went; he then turns to the Ploppys and states "I've got a few notes on today's show" placing the scene on Monday (as Drake and Ethingham were scheduled for execution on Monday and Farrow's death was moved to the same day to give Blackadder the rest of the week off). Lady Farrow then enters with the death warrant she obtained from the Queen in the previous scene, seemingly having travelled back in time a day.
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