Deliberate "mistake": Even if the kids split up on the water slide, only the last two fell out of sequence. Mikey exited first followed by Mouth, and Stef, but then Brand fell before Andy, he should have been last.

Continuity: The design of the treasure map changes from the scene where the Goonies are in the attic to when they are downstairs again (i.e. it has a red stripe across it at first sight, blood perhaps?).

Continuity: In the shot where Data busts through the screen door, you can see his cap fall off as he crashes into Mikey. In the following shot, as the others begin to recover from the pile-up, Data's cap can be seen on his head again.

Continuity: In the scene where the kids are crossing the wooden bridge near the waterfall, Data is seen holding a lantern. After he does his "slick shoes" routine, the lantern has disappeared.

Continuity: In the scene where the kids are entering the hole in the basement of the lighthouse (i.e. the start of the tunnel), Data is seen wearing a pair of white Nike shoes. In the next shot, where his feet are coming down the tunnel, his shoes have changed to a pair of grey/black Nikes.

Continuity: When the back of the Fratelli's ORV is riddled with bullet holes, you can see they make a distinctive backwards "L" shape above the Jeep letters. Later, when Chunk examines the ORV, the bullets holes are now in different places than they were before. Also, the license plate that is seen on the ORV when it is hit by the bullets, changes design as well.

Continuity: When you first see Andy's hands being tied, you can see that they are tied fairly tight. Right before she goes off the plank, you'll see that the rope is barely around one wrist. In the next shot as she is going into the water, you can see her holding her elbows with both her hands.

Continuity: When Mikey takes the skull necklace off Chester Copperpot, he accidentally pulls Chester's skull off his body. When Mikey does this, the skull is still touching the body, just detached and at the wrong angle. But the next shot we see with the skull, when Brandon goes to place the skull back on the body, the skull is about a foot away from the body.

Audio problem: When all the kids are in the kitchen Mikey pulls out his map and starts talking. Even though his mouth is hidden the whole time you can still tell, when looking at his face, he isn't really talking.

Other: In the bone organ scene, when Andy plays her first wrong note, you see Mouth in the next shot and he drops down before the floor even collapses.

Continuity: When The Goonies are all escaping from the ship towards the end, Stef punches Mama Fratelli in the face and in the background you can see some of the kids jumping. It then cuts to a long shot of the ship, and the same kids are seen jumping off for a second time.

Continuity: In the beginning scene of the cop calling out the inmates for their lunch, just as he calls "Hey Turkey." you can see the shadow of the supposedly hanged Jake Fratelli on the right wall. The shadow is totally inconsistent with the design of the cell and position Jake was hanging in.

Continuity: When Stef explains to the others why they shouldn't take the coins of the well, Mouth is standing next to Data silently counting the money in his hands. In the next shot of Mouth explaining how his wish didn't come true, he is now standing farther away from Data.

Continuity: In the shot of the Goonies running to the attic upstairs, you can plainly see that it is not raining or stormy outside. When they enter the attic (barely seconds later), it's already raining outside along with the thunder and lightning.

Revealing: When Chunk is stuck in the freezer with the dead guy, the actor playing the stiff does a good job of never blinking, however you can see his eyes move several times.

Continuity: Whenever Data uses his boxing glove device, it creates a rather large bulge in the side of his jacket. However, this bulge isn't present through most of the movie, it just magically appears whenever Data uses the boxing glove.

Continuity: At the end when the father is about to sign the contract, and right about the part where Rosalita starts screaming in Spanish, the first page of the contract is folded up a little. In the very next shot, all the pages of the contract are flat.

Continuity: Right after Troy is humiliated at the wishing well, the movie cuts to a television food program, with Sloth's reflection visible in it. The problem is that Sloth's face is noticeably different in this reflection than the rest of the film, his left eye is symmetrical with his right one now, instead of it being about an inch lower like it usually is.

Other: 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.

Other: When Data shoots a suction cup at Mrs. Fratelli's gun you can see Mouth in the background with his mouth open. Later Mrs. Fratelli pulls a ridiculous amount of jewels out of his now full mouth. DVD commentary offers an explanation to this, but it IS still a mistake.