Best movie mistakes of 1989
Continuity mistake: In the library scene Indy discovers the "X" high up on the balcony. The X is green with a grey background. But when he breaks the tile to find the tomb the X has disappeared and the ground is a solid green.
Continuity mistake: The batting order in the one-game playoff is Taylor-Dorn-Cerrano (as seen in the 7th), with Hayes batting before Taylor (as seen in the 9th). Cerrano hits the homer with two outs in the 7th, and Hayes is shown batting with nobody on, and two outs in the 9th. If they faced the minimum, Hayes would've been up with only one out (#5 batter gets the third out in the 7th, 6-7-8 batters get out in the 8th, and the #9 batter gets one out before Hayes). There's no way they could've gone through the line-up again without scoring a run. The furthest they could've gotten was the #8 batter (two spots before the leadoff Hayes) coming to bat in the 9th with two outs and nobody on.
Continuity mistake: Notice Marty's hair in the scene when he's playing "Johnny B. Goode." It's quite larger than when he says, some seconds later, "I guess that you're not ready for it yet." That's because when he says that, it's a recycled shot from the original BTTF, whereas most shots showing he's playing the guitar are newly made for BTTF2. However, Marty's hair is considerably longer in the new shots.
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.
Factual error: George comes up with the idea to raise money via a public share issue in Channel 62 around mid-morning, and promptly announces the telethon on the air and by midnight of the same day they have the money they need. One problem. Even if George had access to a compliant attorney and Channel 62 was already a company authorised to issue shares, a public issue would take at least ten days to organise. There are all sorts of notice periods and filing dates to which the share issuer must adhere. I know - I've done it.
Revealing mistake: In the beginning when Michael crawls out of the mine shaft that was just bombed he floats downstream. You see that he floats up to the old man's dock. If you look at him you can clearly see that he is wearing a black lifejacket. The filmmakers didn't even try to hide it under his suit, it is clearly visible on the outside of his jumpsuit.
Continuity mistake: In the scene where Belushi and Jerry Lee (the dog) enter the warehouse, Belushi askes everyone to stop what they are doing and even has the forklift driver lift him up so he can talk to them. Once he is done talking, he tells the lift driver to bring him down. The next few shots where they show Belushi walking to his car, if you look closely, you will see that the fork lift is back up in the air, but there were no sounds and there isn't another lift to be found.
Continuity mistake: Towards the end of the movie Dave takes Walley's jacket and uses it to help them slide down a cable. Before they slid down, Dave tells Walley to hold on, and Walley asks if they're going to be above the ground. Dave tells him no, and off they go. However, Dave is deaf, and reads lips, and Walley is standing behind him when he asks the question. So how did Dave read his lips if he wasn't looking at him?