wait what? break that down
The prop master, who was responsible for the map in the movie was from Newtown. The area was originally named South Hinkley (as in the a.ssassin John Hinkley Jr who tried to k!ll Regan) but was somehow renamed to Sandy Hook.
Since Gotham City is a fictionalized version of New York, some thought the Sandy Hook reference was about the peninsula in New Jersey. Come to find out the prop master( who is in charge of things on a set like firearms, maps, and overall continuity) for the Dark Knight Rises was k!lled in a car accident.