Other mistake: In the tanker truck/pick-up truck chase, after the tanker rams the pick-up and destroys the wooden shelter in the bed, you can see the Terminator turn the steering wheel right but the truck turns left instead. You have to look very closely to see this.
Other mistake: There is a patch on the jacket Harley (Rourke) wears, that appears and disappears throughout the movie. It's on the front lower right side. It is there when he's standing outside their friends' bar with Marlboro, it's gone when they are inside.
Other mistake: When Eve runs into the BMW from behind, the guy slams into his steering wheel. When you are hit from behind, you will slam backwards into your seat. It happens twice, the third time the airbag deploys and stays inflated (real airbags deflate in a second, they are not balloons).
Other mistake: When Sulu tells Kirk he is coming to help, he states the Excelsior is currently in the Alpha Quadrant. The problem is the the Alpha Quadrant in the Star Trek universe is one quarter of the total Milky Way Galaxy. While technically correct, Sulu giving his position as in the Alpha Quadrant is useless to Kirk in terms of knowing when to expect help. It doesn't matter where Khitomer is in the galaxy. Sulu saying he is in the Alpha Quadrant gives Kirk absolutely no idea of when he will arrive. He could be anywhere from 5 minutes away to 5 weeks away or even further. Remember, it was originally projected to take Voyager 70 years to go from the Delta Quadrant back to the Federation in the Alpha Quadrant.
Suggested correction: The implication is that Excelsior has only very recently crossed the border from the Beta Quadrant to the Alpha Quadrant.
Even if that "implication" were true (and there's nothing dialogue-wise to indicate such) it's still useless to Kirk as to when the expect help. The dividing line between the Alpha and Beta is fully half the width of the galaxy.
Sulu doesn't expect Kirk to deduce where the Excelsior is, he tells him directly that they're unlikely to make it in time, and the reason is that they are "now in Alpha Quadrant" i.e. they were previously not in the Alpha Quadrant, i.e. they're far enough away that recently they were in a whole other quadrant of the galaxy. (I agree it's an awkward line, but it makes sense if you think of it like "I'm now in the U.S." if it's known you already live there - it means you've just returned).
Other mistake: Just before the evil robots capture Bill and Ted's girlfriends, after they crash through the window, the girlfriends ask the robots: "Who are you?" and Bill goes "Well, I'm really Evil Ted!" and unzips himself and out pops Evil Ted, and the other robot goes, "And I'm really Evil Bill!" and out pops Evil Bill. When the robots are herding the girlfriends out just before knocking them out with their breath, you can see two sets of clothes in the bottom left corner if you watch closely.
Other mistake: During the fight scene in the TGRI building, when Michelangelo has the ooze and gets jumped for it and loses it, watch the bottom of the screen. Donatello is lying down and trying to get up. But in the next shot he's up and kicks out the ooze from the foot soldier. (00:26:35)
Other mistake: When the paperboy throws a newspaper at Hulk Hogan, and he throws it back, hits him and he falls off his bike into a bush. If you look closely, you can see him run into the bush, instead of being knocked into it.
Other mistake: In the scene with Torch and the lady with the shotgun, after she says, "You may think you got the powers of hell on your side, but you don't know who you're dealing with", Torch raises his flamethrower and Blade watches behind the wall. When Torch shoots with his flamethrower, the lady screams about 2 seconds later. When you see her again in the next shot she is totally on fire. If you think about it, you can tell the timing for the flame is not right and she wouldn't be on fire that fast. (00:36:05)
Other mistake: David's wife is looking inside the microscope at what she describes as a protein found in the saliva. It does not quite look like a protein, and in fact it's a reused (it's exactly the same) microscope image from the previous movie, where Marisa identified it as" a section of the pituitary glans of a Lhasa Apso." (00:12:00 - 00:51:25)
Other mistake: When the FBI agent says "Maybe it's time to get a real job" his partner can be seen mouthing the same words.
Other mistake: Power's out in the building, yet the TV where the landlord gets eaten is on when he walks in the door.
Other mistake: The bus Frank is in crashes through a wall of items, at speed, but no visible damage is done to the front of the bus when we see it later. (00:55:05 - 00:55:40)