Plot hole: This is another movie where the cops are too dumb to go out by themselves. The woman who icepicks the first victim (we see) to death would have left enough forensic evidence on the scene to convict her ten times over - skin, hair, sweat, saliva, vaginal fluid, possibly blood, and they all contain DNA in abundance. She had vigorous, sweaty sex with this man and she didn't clean up afterwards (and she couldn't have done so thoroughly enough anyway) so she's left calling cards all over the place. The killer also handled the icepick (which the police take away in an evidence bag) with bare hands - her prints would be all over it. She might as well have left a signed confession, but they can't even identify her. Sharon Stone, for instance, leaves her fingerprints (on the chair and fixtures in the police station) and her saliva (containing epithelial skin cells which are an excellent source of DNA) on the cigarette butt she discards, also in the police station. She went there of her own accord and these artifacts are legally accessible by the police. It is obvious to anyone that the women who had sex with the victim killed him, and Catherine is most certainly a suspect. They don't have enough to charge her but they would if they did a simple series of tests on the dead man's body - and if she didn't do it, that would eliminate her as a suspect. They don't even check.
Plot hole: When Daniel is in the air with the stolen plane from the Los Alamos air base Nat suddenly appears from behind. However, Nat had no chance to slip into the plane secretely as there was only one stepladder that had been in his mom's full view while she hugged Daniel good-bye. (01:25:30)
Plot hole: Sidney's friends at the beginning act like if he made his fifth shot, he beats Billy. If Sidney had made the fifth shot, he would have merely tied Billy and they would've either gone to a playoff or just settled for a tie. Billy made all 5 shots and Sidney was shooting his fifth,so Billy couldn't lose, only tie.
Plot hole: After District 5 become the Ducks, they have a bunch of fans attending their games from there on out. Problem is, they have fans that show up out of nowhere and also said fans have team merchandise already (sweatshirts, hats, flags, etc). It's also rare for pee-wee hockey teams to even have team merchandise unless they are a long-running franchise.
Plot hole: Guns were prohibited in the town of Big Whiskey. But in the final scene, Little Bill tells the Greeley's patrons to take out their guns and shoot Will Munny once Munny fires the last round in his rifle. A patron is even seen holding a gun after Munny shoots Little Bill and three of the deputies. According to the town ordinance, only Little Bill and the Sheriff Deputies would have had guns in that saloon, and they would not have had to be told. (01:57:00)
Plot hole: After the robbery, Ricky calls Mrs Link to thank her for dinner. Later, he goes to make a phone call, only to discover that the phones have been stolen.