Goofs for
The Englishman Who Went Up a Hill But Came Down a Mountain (1995) More at IMDbPro »

• Factual errors: Elevations of climbable mountains weren't then and aren't now determined by triangulation to known landmarks; it would have been done by "spirit levelling," which is, more or less, a local measuring of one's vertical change along a path from an already established elevation which, in turn, is ultimately tied to sea level. Elevations determined by sightings to remote landmarks, as in this film, would be very imprecise because of atmospheric refraction. Indeed, if such a technique could have worked, the hill elevation could already have been determined by measurements from the supposed reference landmarks. A resurvey of a hill that might have turned it into a mountain would have been a differential measurement. The surveyor would only have had to measure the elevation change between a nearby point that he had already passed through on the way to the summit, and the modified summit.
  
  
• Errors in geography: The Bristol Channel should be visible from the hill. Also missing is the Taff River and Castell Coch.
  
  
• Crew or equipment visible: At the end of the scene where the Reverend slashes the front tire of the Englishman's car, a reflection of a crew member can be seen in the windshield of the car after the Reverend exits.
  
  

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