Harrison Ford's Hat?
One of the Fratelli brothers, Jake, wears a hat the entire film. That hat belongs to Indiana Jones' from Raiders of the Lost Ark and Temple of Doom.
Real Life Families Make a Cameo
In the end of the movie, all the Goonies meet up with their families after having gone on a wild adventure in search of treasure. This scene is a good way to see the actors' actual families! Each actor "reunites" with his real parents and sometimes even siblings (except for Josh Brolin and Sean Astin, who had actors portraying their mother and father). For example, the people that "Chunk" (Jeff Cohen) hugs and receives a pizza from are in fact his real mother, father, and sister.