The word SHIT is said 19 times in the film. Boy, how kid's movies have changed... For the worse.
The young actors didn't see the pirate ship before the scene was shot. When they did, they screamed, what else... But, "HOLY SHIT!"
The last name of the brothers who chase the Goonies is Fratelli. Fratelli means "brothers" in Italian. Big reach there.
The actor who played Data promised his mom he wouldn't use any bad language. So he spelled out the word SHIT when asked to scream HOLY SHIT. And yes, this whole post is about shit.
The Official Goonies Oath was cut from the final film. "I will never betray my goon dock friends / We will stick together until the whole world ends / Through heaven and hell, and nuclear war / Good pals like us, will stick like tar / In the city, or the country, or the forest, or the boonies / I am proudly declared a fellow Goony." Sad they couldn't find a place for that.
Sean Astin kept the treasure map used in the film. His mother later found it, thought it was trash, and threw it out. ASSHOLE!
One-Eye Willie's full name is never spoken, but is actually William B. Pordobell. The former certainly has a slightly nicer ring to it.
All of the bats seen in the film were made of crumpled pieces of black crepe paper shot from an air cannon.
The Mayor of Astoria (where the movie was filmed) recently declared June 7th "Goonies Day." Just in that town, but it should be recognized as such everywhere.
The film's accompanying book states that Chunk's parents do, in fact, adopt Sloth. They even throw him a Bar Mitzvah. I've got nothing witty to say about that one.