Wing Commander famously centered on a pilot known as Maverick, with Iceman being one of his squadmates. However, in this case, "Maverick" is lampshaded as being an Ironic Nickname for the cool-headed by the book pilot. His wingman Maniac is another matter entirely...
Throw It In: Iceman biting his gum and snapping his jaw at the end of the locker room scene was not scripted. Val Kilmer just did it, effectively getting the final word over Cruise.
Truth in Television: The training accident that kills Goose was entirely possible due to the design of the Tomcat. Early Tomcats had Pratt & Whitney TF30 engines which were underpowered for the aircraft, resulting in compressor stalls at high angles of attack. The space in between the two engines would also easily result in a flat spin due to the massive amount of asymmetrical thrust should one engine crap out.
Unintentional Period Piece: The top box office gross of the year, two huge hit songs, and capturing just about everything that was special about the decade, Top Gun practically is 1986.