The USS Intrepid (CV-11) Essex Class aircraft carrier has been converted into a Aerospace Museum located in New York City since 1982.
When the helicopter is struggling to land near the end, the rain is clearly from one large hose - it is only raining on one part and is rotating.
On the closing credits William Zabka's credit is listed in the wrong order (his actual name is credited as the character name and his character's name 'Rance' is listed as one of the actors.)
At the beginning of the movie, when the house gets blown up and the cop car gets blown back, the hydraulic bar used to push up and throw away the car is visible on the lawn.
The weather forecast showing a radar map of around Midway Island actually shows Santa Catalina Island, which is about 25 miles off the coast of California. Midway Island is in the middle of the Pacific Island.