The Goonies will turn 29 in just 2 days, so I've compiled a list of trivia related to the film. Hope you enjoy!
All facts were taken from the IMDB page, unless stated or sourced otherwise.
Producer trademark (Steven Spielberg):  Data's belt has "007" inscribed on it. He also listens to the James Bond theme before sliding on the rope over to Mikey's.
In the original version of this film, the woman hired by Mikey's mother is a Hispanic named Rosalita (Lupe Ontiveros), and Mouth helps Mrs. Walsh by translating her commands into Spanish. In the Spanish version of this film, Rosalita becomes an Italian woman named Rossanna. The Italian used by the Spanish dubber is much better than the Spanish used by Corey Feldman.
The Goonies Oath that was cut out goes as follows: "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."
The cast was not allowed to see the pirate ship before the scene was shot. When they did see it, some of the kids said "Holy shit!" The scene had to be re-shot without them cursing.
Jeff Cohen got the chicken pox after he got the role of Chunk. He showed up to the set anyway, afraid that they would have replaced him otherwise.
According to Sean Astin, he was allowed to keep the treasure map used in the film. Several years later his mother Patty Duke discovered it, thought it was just a crinkled piece of paper, and threw it in the trash.
When rocks are falling from the cave ceiling, Jonathan Ke Quan (Data) screams "Holy S-H-I-T!" He said he spelled the expletive because his mother made him promise not to use any bad language in the movie.
The pirate ship was entirely real. All the shots were filmed in the ship. One Eyed Willie's ship, The Inferno, was 105 feet long and took 2-1/2 months to construct. It was modeled after Errol Flynn's ship in The Sea Hawk (1940). The sails required more than than 7,000 square feet of material, the largest measured 30ft by 60ft. Some of the ship's rigging was recycled from the Pirates of the Caribbean ship at Disneyland, which was being renovated at the time. After the film, it was offered to anyone who would take it. No one wanted it, so the ship was scrapped.
John Matuszak (Sloth) is wearing a t-shirt of the Oakland Raiders, a team he once played on.
When the Fratelli brothers argue Anne Ramsey really slaps Robert Davi. She was told to hit him as hard as she could.
Mikey mentions Michael Jackson going over to Chunk's house in one scene. In real life, Corey Feldman (who played Mouth) was close friends with the singer and the two later became estranged. Feldman attended Michael Jackson's memorial service after his death in June 2009.
Cyndi Lauper co-wrote the theme song "Goonies R Good Enough", and shot a music video which was divided into two parts (Part 1, and Part 2) that features a cameo by the film's executive producer Steven Spielberg. The video basically tells the movie's story as a musical. Cyndi Lauper plays Cyndi (a new Goonie recruit), The Bangles play pirates, and André the Giant plays Sloth. When the boys are sitting in the living room watching MTV, they weren't actually watching the the music video. It was developed six months after filming wrapped up.
When Chunk is hiding from the Fratellis in the refrigerator with the dead body, he sneezes loudly. As Mama Fratelli exits the room she unwittingly says "Gesundheit!", the German word for "Health" used as a response to a sneeze.
In the storybook of the film, One-Eyed Willy's back-story is told by Francis Fratelli, when The Fratelli's take the doubloon from Chunk. One-Eyed Willy, whose real name is William B. Pordobel (this name resembles Portobelo, a Panamanian port which has long been home to pirates), was a court jester, before becoming an ingenious pirate, when he was banished from five Spanish courts, for his practical jokes and formed a band of pirates, whom marauded hundreds of the king's ships and accumulated a treasure worth millions. But, Willy's ship "Inferno" was attacked by three of the King's ships and Willy steered his ship into a hidden underground cavern and was sealed within by the canon fire from the British. Willy and his men had spent a couple of years trying to repair the ship and had built underground caves with weird booby traps to protect the treasure and one of Willy's men escaped to tell Willy's story, which became a legend.
Near the end of the movie, Data says something in Chinese and Chinese subtitles are shown. The subtitles translate to "He is a big strong man".
Jeff Cohen (Chunk) thought of his mother dying to generate tears during his "confession" scene with the Fratellis. (His mother didn't die. She played Chunk's mother in the film.) During the scene, one thing he admits to is pushing his sister Edie down the stairs and blaming it on the dog. Cohen's real-life sister is named Edie. And the basis for the theater story was a real-life prank pulled by Executive Producer Steven Spielberg while growing up in Phoenix, AZ.
John Matuszak's make-up took 5 hours to complete. One of the eyes (which was out of place on the face) was mechanically operated off-screen by remote control. Someone would count down, and Matuszak would blink his other eye in synchronization. The cast was told not to get him wet in scenes outside of the pirate ship. Unfortunately, he got wet, delaying filming for an entire day.
Ma Fratelli and her sons are based on the early-20th-century legend of Arizona Donnie Barker (known as Kate, or Ma Barker) and her boys.
In the storybook of the film, there was a scene, that was not in the film. Mikey, Mouth, Brand, Data, Andi and Stef discover a room with a dangling skeleton in a pirate's costume. The Goonies had to tickle the skeleton's elbow, which would point to one of three tunnels, where they must go. Stef tickles the skeleton's elbow and it points to the middle cave and The Goonies continue the search for One-Eyed Willy's treasure.
That's it! Is there anything I left out that you felt should have been in this list? Let me know in the comments!