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.
What Could Have Been: Bryan Adams was approached to use his song, "Only the Strong Survive," but he refused since he felt that the film glorified war.