Stupidity: As the position of the Tiger was perpendicular to the Sherman platoon's line of march, and they were advancing across totally open country with firm ground all around, it didn't matter a hill of beans whether they shot the first or the last tank in the column.
Suggested correction: You really didn't explain the context here. Was there a big discussion of which tank to shoot first?
The mistake is saying that the tank column was travelling through an open field. It wouldn't matter if Tiger 131 hit the lead or rear tank in the column as they could manoeuvre around the disabled tank. A somewhat valid point.
You missed the point of the correction. Is it shown in the movie that they specifically targeted the first tank?
Stupidity: Patrizia Reggiani is no rocket scientist in this movie, but it's quite bizarre that calling the fortune-teller she sees on TV, with her name written in giant letters in two different spots on screen, she asks her "What's your name?" It makes sense for the international audience who may not recognize the word "Pina" as a name, but an Italian wouldn't have any doubt. (00:41:05)
Stupidity: During the movie, the bad guys keep the main character alive and free to roam the facility at will (even if they made him sign an incriminating form at the very beginning stating he's an inmate) doing absolutely nothing to restrict his freedom till the very end - he even retains personal effects like his broken Rolex and lighter, his wallet full of cash! He breaks into every forbidden area, picks up fights, damages property, escapes multiple times and 'corrupts' the person the whole facility is built for. He is worth absolutely nothing to them and has nobody waiting for him or that will look for him.
Stupidity: I won't begrudge Father Lamont for instinctively grabbing for the first thing in reach to try to smother the box on fire (even if it is a pair of wooden crutches), but you'd think at some point he'd notice that he's just spreading the fire and making it much, much worse, but he keeps at it until the doctor finally returns with the extinguisher.
Stupidity: At the end of the movie during the shootout. Cops would not engage in automatic gun fire with dozens of civilians in direct cross fire. Why not get a chopper and chase them down a bit maybe in an open area with fewer civilians? Then maybe engage in gunfire.
Stupidity: Charlie set her mom's blouse sleeves on fire and mom/Vicky just stood in the same spot, holding her arms (burning sleeves) out in front of her until Andy came and smothered the flames with a blanket. Even children know to "drop and roll" or put fire out by smothering it. (00:22:56)
Stupidity: After Dan confesses his affair to his wife, he never thinks about bringing the tape Alex had sent him to the police. This would have been proof beyond a reasonable doubt of her mental instability and harassment of him, and she would have been immediately sought out and likely committed to an institution, and both of the film's endings wouldn't had to happen.
Stupidity: During the battle on the harvester, Chani is firing an anti-aircraft projectile at a Sardaukar approaching her. Although the projectile is strong enough to destroy an ornithopter, instead of blasting the Sardaukar away, it pushes it into the air until it hits the harvester track. (00:36:39)
Stupidity: There is a scene in which the phone rings back at the house and Andy goes to answer it. None of the henchman respond immediately, but instead WAIT for him to almost answer the phone before becoming making a move. You would think they would yell at him to not answer it or have one of them rush to guard the phone the moment it rings. Obviously the entire scene was done this way for the sole purpose of suspense.
Stupidity: It's very idiotic that Michael and Karen kept the same security password, even after being harassed and not feeling comfortable with Pete being around them any longer. There's no way the pyramid password should have been kept the same, with Pete being able to enter their home, plant drugs, and frame Michael. Changing your security password, the same password that the lunatic cop once knew, would be the first thing to do after his psycho behavior starts.
Stupidity: Scott spread his lie about the protagonist telling Dean, who tells Frank (without details, just that the guy is 'a good fighter'). So barely one person (acting rather childish for a supposed master) has any animosity towards the new fella. There are over two dozens people in the class (in a 'good guys' gym, not one of those evil moustache twirling villain dens) and yet everyone is happy and cheerful watching a black belt beat the snot out of a schoolboy redbelt, for no reason. Most people there are grown-ups and there are black belts; they should be horrified or at least VERY puzzled. (00:30:00)
Stupidity: Lyla does not like the idea of Mickey fighting and initially does not want him to agree to the fight. Lyla eventually tells him "okay", but he must stop when she tells him to stop. This may give her a reason to go to Dubai, UAE with him, but she is about 8 months pregnant. An international flight has some risks plus she would be far away from her OB-GYN doctor if there were a complication. She should have had enough sense to avoid international flights/traveling so close to her due date.