Goofs for
The Terror (1963) More at IMDbPro »

• Revealing mistakes: When the castle floods, some of the stone floats.
  
  
• Continuity: Karloff has stark white hair throughout, though his stunt double in the water at the climax has black hair.
  
  
• Anachronisms: When Jack Nicholson is in the room searching he comes upon a set of dueling pistols. When he opens the chamber of one, you see a metallic cartridge which were not invented for another 40 years.
  
  

• Anachronisms: Samuel Colt (1814-1862), the inventor of the revolver, took his first European patent for his invention in 1835, and as Lt. Duvalier searches the castle, he carries a revolver around. The movie is set 20 years after Ilse's death, making the year 1802, as her gravestone clearly states 1761-1782, therefore Lt. Duvalier is carrying around a weapon made by a man who won't be born until 12 years later. Another matter of curiosity regarding this is the fact that it is a snub-nosed revolver, though nobody exactly knows when it was conceived, most believe it was invented in the American west in the late 19th century, presumably by a person who thought it would be easier to fast-draw from a holster.
  
  
• Revealing mistakes: Watch for the stones falling from the castle ceiling at the end, then floating away.
  
  

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