Other mistake: At one point, Indy rolls off of the side of a tank, and somehow gets a strap around one of the guns pointing out from the sides. The end of the barrel has already been blown open by the rock he shoved in earlier. How did the strap get around that big cluster of metal, and then back again so he could climb back on the tank? (01:34:15 - 01:35:05)
Other mistake: Sergeant Johnny Gallagher (Gene Hackman) and Lieutenant Milon Delich (Dennis Franz) are in a supposedly deserted building searching for a group of conspirators who plan to assassinate both the USA and USSR presidents. Delich finds a police colleague of his in the building, and Delich kills his colleague. When he fires his revolver, the sound of the blanks can be heard, slightly out of synch with the gun blasts on the sound track.
Other mistake: During the one game playoff against the Yankees, the runner Taylor picks off at first base has the same number as the batter who had just struck out. Also, the number they both wear has been long since retired by the Yankees and therefore no player could ever wear it again. Again, in the first game against the Yankees, the first base coach also has the same number, making it three Yankee players with the number 37.
Other mistake: When Miyagi throws Mike into the light switches, the lights go out but the switches never change position.
Other mistake: Their big 4x4 at the end is really a two wheel drive. When they make the big jump with the fire all around them you can see the front end in the light. There is no front differential, just two big A frames.
Other mistake: In the final scene when they are about to charge Fort Wagner, Mathew Broderick yells "forward march!" and takes his first step with his right foot when it should have been his left foot like the rest of the battalion.
Other mistake: In the bar scene where Dooly is being beat up by the bar thugs, When Jerry Lee starts to attack them there is a shot of the dog lunging at the thugs. If you look carefully at the shot the dog is fake. You must look very carefully it is only a second. (00:32:30)
Other mistake: When Joe Clark first comes to Eastside High as principal, he takes it upon himself to confront the staff. At one point, as he begins to turn his back, watch his lips. His mouth does not match the words being spoken.
Other mistake: When Doc, Marty and Jennifer have arrived in 2015 Doc tells them that the time of the day is 4:29pm. However the destination time is still shown on the time circuits' display from their time travel to the future - the two times should match, but the destination time has the bottom AM/PM light illuminated, while the current time has the top one lit. They didn't arrive or leave at 4:29am, so something's wrong somewhere.
Other mistake: During the big protest march scene which is supposed to have taken place in the early '70's, one Vietnam vet who is sitting in a wheelchair is clearly wearing a pair of high top Reebok sneakers introduced in the late '80's.
Other mistake: Another note about Clark's falling through the ceiling and onto his son's bed: Take note of the shot of him in the attic after falling through the ceiling. He's standing on the upper bunk of the bed now, but from the shot in the attic, he's only down to his knees or so. Assuming his home's ceiling joists are 8 inches or so, then the mattress of the upper bunk would have to be no more than, say, 10 inches from the ceiling for that much of him to still be in the attic while standing on the bed. I've never seen a bunk bed whose upper bed gave you less than a foot of space between mattress and ceiling! (00:33:05)
Other mistake: Watch closely as Investigator Natsuo kicks through the windshield and kicks the villain in the face. The villain's head caves in like it is made of cardboard.