Goofs for
The Blue Lagoon (1980) More at IMDbPro »

• Continuity: After Paddy dies, and the children pack up the dinghy, the handmade toy boat is prominently displayed on top of their belongings. Years later, when they return to the original hut, Richard is digging through the rubble and finds what is left of the toy boat that he clearly took with him.
  
  
• Continuity: The rainy day gives way suddenly, and the beach is very dry.
  
  
• Continuity: Emmeline's hair changes length suddenly several times.
  
  

• Audio/visual unsynchronized: When Paddy slides down the waterfall shouting, his mouth isn't moving.
  
  
• Continuity: Richard comes out of the water at one point with his hair, of course, dripping wet. A moment later his hair is completely dry.
  
  
• Revealing mistakes: When Richard goes fishing from the boat and his catch is attacked by sharks, tearing the line from his hands, a rope can clearly be seen dragging the first (presumably dead/fake) shark through the water
  
  
• Revealing mistakes: As Richard and Emmiline observe the crab coming out of the mouth of Paddy's "dead" body, you can see his nostrils flaring as he breathes.
  
  
• Revealing mistakes: When Richard and Emmeline have a fight she sleeps in her own shelter during a storm you can see a rope at the top of the shelter pulling it down.
  
  
• Continuity: After Emmeline teaches the baby to swim, they go swimming together. In the underwater shots they have no clothes on but in a close-up of Emmeline, a little piece of clothing is visible.
  
  
• Errors in geography: There are both macaws and cockatoos on the island. Macaws are from South America and Cockatoos are from Australia.
  
  
• Continuity: Richard is right handed as a child but left handed as an adult.
  
  
• Continuity: The night Em has the baby, Richard hears the drums and it's daylight. He goes to the other side of the island, it's night time. Then Emmeline has the baby and it's daylight again as it turns to dusk.
  
  
• Audio/visual unsynchronized: When Emmeline is teaching the baby how to swim, she calls Richard down to watch. When Em is holding the baby, you can hear a child laughing that doesn't match any of the actors. Later, you hear the toddler Paddy laugh and it sounds identical to the laugh heard before.
  
  
• Revealing mistakes: When Paddy and the kids first sight land and begin to sail toward it, the mountainous coastline of a large land mass can faintly be seen behind them, indicating that the island is not as remote as we are led to believe.
  
  
• Factual errors: When Emmeline walks in the water she accidentally steps on a fish and gets sick. The fish that the movie shows is called Stone Fish and in fact if you step on one the venom will cause excruciating pain and also shock, paralysis, tissue death and if not treated within few hours also death. Emmeline doesn't seem to suffer from any of these symptoms and it seems it takes some time until Richard finds her.
  
  
• Continuity: The lifeboat Mr. Button and the children take is a simple dinghy when it's still on the ship, but the first morning they are lost at sea, it has somehow acquired a mast and sails.
  
  
• Revealing mistakes: Richard and Emmeline have both come of age on an island away from civilization. Both are clean shaven, however. While a teenage boy may not sprout a full beard Richard should at least show growing sideburns and some peach-fuzz on the chin. He even references that he is growing "all these hairs" on his body. Likewise, Emmeline's armpits should be hirsute. How did they learn to shave and where did they get razors?
  
  
• Revealing mistakes: Em, while growing up on an island away from civilization, has remarkably clean nails and manicure throughout the entire movie. A number of close-up scenes show her impeccable manicure.
  
  

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