Factual error: During the final battle over Area 51, Russell Casse appears in his F-18 and states he is armed. After he attempts to acquire radar lock on the alien's primary weapon, he states he is locked on and has tone. He then says the tactical brevity code Fox-2, which indicates the launch of an infrared-guided missile. However, the missile he is actually attempting to launch is an AIM-54 Phoenix, which is an active radar guided missile, designated by the launch code Fox-3. The master monitor display also incorrectly shows the missile mounted on the port wingtip launcher of the aircraft where the AIM-9 Sidewinder would normally be mounted, instead of on the port wing's weapon pylon where the missile actually is. Historically, the F-14 Tomcat was the only fighter capable of carrying the AIM-54, as it was such a heavy missile; the AIM-54 was never used on the F/A-18. Instead, they carry the AIM-120 AMRAAMs, not the AIM-54 Phoenix that were shown in the film.Stonewall
Continuity mistake: When General Grey tells the President not to engage until they have visual, in the President's close-up the exterior of this F/A-18 Hornet is quite different than what was shown in the earlier shot, as the canopy closed over him. All the rivets around the canopy have disappeared and the 'danger' triangle is much closer to the name Patrick, the seat differs, etc. Plus the fact that the canopy and hull are actually one unit in the second shot. (02:02:15 - 02:03:15)Super Grover
Trivia: According to the Director's commentary, Twentieth Century Fox Film Corporation did not want the film to be released under the title "Independence Day" to avoid legal complications (specifics weren't disclosed as to what the problems might be, but it's also why the abbreviation "ID4" was used). Roland Emmerich (director/writer) and Dean Devlin (writer) needed to justify the title, so they added the rousing bit right at the end of President Whitmore's speech at the hangar when he ends with, "The 4th of July will no longer be known as an American holiday...today we celebrate our Independence Day!"Super Grover
Trivia: When Steven and David are being chased out of the alien mothership, David says "Must go faster, must go faster." This is a line Jeff Goldblum said in the film Jurassic Park (1993), when he was riding in the back of a jeep, getting chased by the T-Rex. That line from Jurassic Park was loved so much by ID4 filmmakers, they looped it into the dialogue. Jeff never actually spoke that line when ID4 was being filmed.
Captain Steven Hiller: Y'know, this was supposed to be my weekend off, but noooo...you got me out here draggin' your heavy ass through the burnin' desert with your dreadlocks stickin' out the back of my parachute. You've gotta come down here with an attitude, actin' all big and bad...and what the hell is that smell?!
President Whitmore: Good morning. In less than an hour, aircraft from here will join others from around the world. And you will be launching the largest aerial battle in the history of mankind. Mankind, that word should have new meaning to all of us. We cannot be consumed by our petty differences anymore. Perhaps it is fate that today is the fourth of July, and we will once again be fighting for our freedom. But not for freedom from tyrrany or oppression or persecution. We're fighting for our right to live, to exist. And should we win the day, the Fourth of July will no longer be known as an American holiday, but as the day when the world stood up and declared in one voice that we will not go quietly into the night! We will not vanish without a fight! We're going to live on! We're going to survive! Today we celebrate our Independence Day!