The Harrier Climax
Every time I've watched this movie I've been stunned by the Harrier sequence at the end. I always thought it was done using blue/screen, which really impressed me for an early 90s movie because the lighting on the actors matched the background perfectly. Also, the foreground blends perfectly with the background without that black outline that plagued other movies from around the same era. I thought this movie was way ahead of its time.
Now I just found out that it WASN'T actually blue/green screen. James Cameron actually used a scale model of a Harrier jet, hoisted it up 25+ storeys with a construction crane and literally filmed much of this sequence up there next to a skyscraper with all the actors secured with harnesses. THAT'S JUST INSANE! Wow, now I'm even more impressed by this sequence. No wonder it looks so good and holds up almost 30 years later!