Visible crew/equipment: When Blackadder and Melchett leave to go visit the Queen and they close the door, the boom mike is visible in the upper left corner of the screen. (00:05:05)
Deliberate mistake: There are a lot of jokes with the name of the book "The Prince and the Pauper." However the book was published in 1881, 51 years after the Prince Regent died.
Visible crew/equipment: After Blackadder has pushed Queen Elizabeth into the closet and sits down at the table, Percy "coughs". When it cuts back to Blackadder, you can see the boom mike above his head. (00:17:00)
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.
Visible crew/equipment: When Blackadder is about to leave Captain Redbeard and Redbeard says, "So you do have some spunk in you," you can see the boom mike pop into picture in the upper right corner of the screen. (00:12:50)
Factual error: After the Shadow has left Blackadder a captive, she says how much she hates squirrels, and fires two shots from a single shot pistol.
Visible crew/equipment: After King Richard has been crowned, Blackadder, Baldrick and Percy return to their chambers and start cheering. When Blackadder says "We're safe, and I am a prince of the realm" you can see the boom mike move up in the right corner of the screen. (00:16:50)
Revealing mistake: When Blackadder lifts the huge turnip it looks really light. A turnip that size would weight a fair bit.
Continuity mistake: Right at the very end, when everyone is lying dead on the floor, Stephen Fry's eyes are still moving. (00:29:00)
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.
Visible crew/equipment: When Harry comes to see Blackadder and asks how the entertainment program is going, Harry says that St. Leonards himself was a eunuch. As it cuts to Percy agreeing, you can see the boom mike move right above Baldrick. (00:08:40)
Visible crew/equipment: When Edmund returns to his house and complains about the smell as he enters, the edge of the set is visible on the extreme right of the picture, just before the camera zooms in on him.
Deliberate mistake: Edmund's "recollection" of seeing Henry Tudor includes the footage that the audience saw at the beginning; however, Edmund wasn't present when this happened, and thus should not be able to recollect it. Moreover, this scene occurred after Henry had escaped and was in safety, altering the details of the Battle of Bosworth Field. Clearly, the footage was added for the audience's benefit, to be able to link the injured Henry to the introductory scene at the start of the episode.
Revealing mistake: At the very end of the episode, right after Edmund drinks the wine, the camera switches to a close-up. Watch the very animated 'dead' extra right behind Edmund who seems to be unsure whether the scene is in the bag yet or not. (00:29:25)
Audio problem: When Blackadder explains to Baldric about what he is not allowed to prepare for dinner Blackadder says "And that means no meat." There is a glitch before he says meat, it may be where they stopped recording before the sentence was finished.
The Witchsmeller Pursuivant - S1-E5
Revealing mistake: The edges of Blackadder's bald cap are visible next to his right ear when he is visited by the queen and princess. (00:24:45)
Visible crew/equipment: When Blackadder returns to the castle after rounding the sheep, Prince Harry says "Ah, Edmund." Blackadder then walks behind one side of the wall. The shadow of a boom pole can be seen on the right side of the wall as he does this. (00:02:40)
Revealing mistake: When Flash says "I've got a plan and it's as hot as my pants", his moustache is seen falling off.
Continuity mistake: When Flasheart hits Edmund with the gun, he swings his arm to the right, but Edmund falls to the left.
Answer: According to the IMDB.com's quote page for Blackadder The Third, it's "Aahhhhh. Hot potato, orchestra stalls, Puck will make amends. Owwwwww."
Gary O'Reilly