Corrected entry: If the secret tunnel system leads through the pipe-filled passage below the country club, then why have the tunnels remained such a secret? Surely when those pipes were built or maintained, the workers would have noticed the tunnels.
Corrected entry: At the beginning of the movie, when the Goonies find the map in Mikey's attic, Mikey says that the Inferno was chased into the cave by the British Armada, who then sealed the entrance of the cave with cannon fire, trapping One-Eyed Willy and his crew inside. Yet near the end of the movie, Mama Fratelli sets off a trap which makes the blocked entrance of the cave crumble, and revealing the mouth. If One-Eyed Willy was able to build a trap that could do this, why didn't he just unblock the entrance and sail away to enjoy his plundered wealth, rather than stay trapped in that cave and die.
Corrected entry: When Data falls into the pit where the spikes are at the bottom, he sets off a device where a set of plastic teeth catch the roof of the pit and save him. Plastic teeth like that would not catch a spike at the top of the pit and still hold Data up.
Corrected entry: If all the kids entered the same water slide, how is it they exit through different holes? There is no shot showing them splitting up. In fact, in one shot, two of the kids are shown almost on top of each other when sliding down the water slide.
Corrected entry: The movie says that the Goonies' house is in danger because it's wanted for a golf course. But they live on a very steep and hilly street - exactly the opposite of the open, flat (if with low hills) kind of land needed for a golf course.
Corrected entry: In the bone organ scene, before playing the last note, Andy says that she doesn't know if it's an A sharp or a B flat. On a piano or organ with the standard keyboard (and there is no reason to think that this organ uses anything else) these notes are the same and played with the same key.