Plot hole: Suzie pulls out some of her teeth with a pair of heavy pliers. This would leave conspicuous tool marks on the teeth that would be visible to the naked eye, let alone under forensic examination. The conclusion would be that Suzie is missing, not dead, and the whole plot would unravel from there.
Plot hole: The first time they communicate with the "entity" in the spaceship, they find a correspondence between numbers sent by the entity and letters of the alphabet. The entity presents itself as "Jerry". Later on, the entity tells Dustin Hoffman, "Stop calling me Jerry" - and then Dustin Hoffman realizes that the number-letter correspondence was wrong, and the actual name of the entity was "Harry". But if that is true, how could they have communicated without problems before? The very first word that the entity used was "hello", which would have to be displayed wrong, since it begins with an "h" and has an "e".
Plot hole: In the end of the film it is heard the police want to exhume the body of Charles Lee Ray from his grave site in New Jersey. Now when Chucky and the crew get to the grave site they find and kill a coroner who is digging up the body. He is the only one there at 1am, by himself, a lonely coroner without any police officers, after all this is a police investigation and I doubt the cops would have him there alone. Then right at the end the Detective who is hunting them arrives. Now he is a cop from Lockport, about six states away. A. Why did he drive all that way to see the body? B. A cop from all the way down there shows up but no new Jersey cops are at the scene?
Plot hole: During the end the murderer is thrown out the front window of the building. The students leave the building through the front door, but yet there is no body, and that doesn't seem to bother them!
Plot hole: The original ending planned was a massive tropical storm/water based chase scene. However, this was decided to be too expensive, and was switched for a cheaper, and some say weaker ending. Nonetheless, in Nicholas Cage's final speech, he says "I keep thinking about that tunnel, and what would have happened if I'd drowned." This makes no sense, given that in the new ending he came nowhere near a tunnel or drowning.
Plot hole: The government would have no chance of hiding the existence of the comet for a year. Most comets are discovered when they are very faint, literally thousands of times fainter than Wolf-Beiderman when Leo found it. Long before the events in the film take place, probably even before the government itself would be notified, the comet would have been discovered, an orbit calculated, and people panicked. The whole premise of the first half of the movie is thus based on flawed logic.
Plot hole: In the scene where Katrina is watching through Valek's eyes as he kills father Molina, Crow orders father Giteau to "find out where an old padre is missing". But Katrina never described father Molina, all she said was "He killed the priest". Crow could not have known the age of the man who was killed.
Plot hole: In the lobby of police headquarters, Danny Roman's lawyer tells him to make a deal with the prosecution. Danny turns to his wife Karen and tells her to wait in the car and he will be right back. Then he proceeds to go upstairs and overtake Niebaum's office. Much later when Chris Sabian is negotiating, Karen arrives on the scene wondering what's going on. How long was she waiting in the car? (00:28:35)
Suggested correction: This isn't a mistake. Karen (and anyone else still on the property) would have been sent away by the police once they became aware of the hostage incident. She went home to wait for Danny because she doesn't know he is the perpetrator. When she is called back to the scene by Sabian she wonders what is going on because she doesn't know that Danny has taken hostages in the building.
So she drove there with him and then just leaves him there? Lol. Can't see her just leaving without him since they drove there together. Even if people went around telling everyone to leave the area, I just can't see her not hanging around and waiting for him.
Plot hole: As the characters arrive at 'the Jar', Brill informs Dean that it is entirely cut off from the outside world (no communication lines or radio waves). Yet somehow he is able to access a Government database from this very location.
Plot hole: The kidnappers initially ask for a ransom of $50 million. $20 million in $20s, $20 million in $50s, and $10 million in $10s. This translates to a grand total of 2.4 million bills (pieces of paper, that is) Every bill of American currency is 2.61 inches wide, 6.14 inches long, and .0043 inches thick. This makes roughly 2,791 bills to form a 1 foot tall stack. This means that the 2.4 million bills would take up a space of 96 cubic feet (assuming they are packed as tightly as possible). Also, since 490 bills make 1 pound, the 2.4 million bills would weigh (interestingly enough) just over 2.4 tons. No way they can move it.
Plot hole: After Riker takes the Enterprise through the Briar Patch to communicate with Starfleet he returns to rescue Picard from the collector in mere minutes, even though it was supposed to be a 2-day journey.
Plot hole: When Karen is at Moselle's apartment looking for Snoopy, we overhear Kenneth on the phone talking about some boxers who are going to fight. The first thing we hear is him clarifying that the fights were at the State Theater. The fights are always at the State Theater and they always go there to watch them, so it makes no sense for him to have said that, other than to subtly benefit the plot.
Plot hole: In the scene in the woods right after Mel has gotten mad at Bobby he asks "Have I ever steered you wrong?" and Bobby shakes his head. Yet, it was Mel's idea to sell the drugs to Hitler's Henchmen, getting himself shot, getting Bobby beaten up and causing Rosie to lose the baby in the process. Maybe Bobby just didn't want Mel to hit him again. (01:01:05)
Plot hole: When Swayze goes through the weigh station, he is told he is exactly 80000 lbs in the US for a tandem tractor/trailer, (which is the legal limit, unless he has a permit, but unlikely to be EXACTLY that weight due to fuel burn, weight of driver, tools, etc) and sent around to have the load inspected. In 11 years of driving I have NEVER had a scalemaster inspect a load inside a dry van. Customs agents do, but not scalemasters. Also, Swayze tells the scalemaster he doesn't know why the pit bull is there, as he just picked up the trailer. That excuse wouldn't fly with an official. Finally, the way the trailer is loaded, the load would shift all over the place, probably not making 100 miles before being destroyed. (00:38:10)
Plot hole: Considering that this family has been training for the mission for years and certainly have received some instruction in astrobiology, they are awfully carefree around the cute little alien. Any real space farer would be aware of the enormous potential problems with first contact, like incompatible biochemistry (aliens might exude deadly toxins from their skin, be eaten alive by human-exhaled oxygen, etc). They even feed it human food without analyzing the alien; again, this could kill it, make it chemically dependent, cause it to go into a mating cycle, etc. But it's cute alien, so naturally they don't worry about any of this.
Plot hole: If Marybeth was able to seal her nostrils and use her extended finger to remove the cap and make nobody suspicious about her, why didn't Delilah do the same thing? She was alien, so she should've still been able to do it, same as Marybeth.
Plot hole: When the armored guy is propelled under the tanker trailer, his backpack explodes. That blast can not have been large enough to lift the entire trailer through the air. The trailer never explodes itself, and if it did, the tank itself would have torn apart and the frame beneath would have stayed on the ground, pushed down by that blast above. (Oh, and there's no such "safety feature" that is intended to launch a trailer in the air in case of an accident.) (00:05:00)
Suggested correction: Only 3-4% of the visible universe has been discovered. Meaning this comet could have been discovered much later.