Plot hole: The Bishop in the film is performing the duties you would expect of someone in his position (giving mass, hearing confessions, performing weddings etc.) He has his own private chambers in the cathedral, refers to Robin as 'the boy I knew' and talks about hearing his Father's confession four months earlier; so he's been around for a while. The problem is the credits refer to him as the 'Bishop of Hereford'. No explanation is ever given for why the Bishop of a city 100 miles away is living and working in Nottingham rather than looking after his own diocese; or why the Bishop of Nottingham isn't around to look after his. (The Bishop of Hereford was an enemy of Robin Hood in the original ballads, and it's likely the filmmakers just gave that name to the Bishop in the film due to its familiarity, without thinking about the plot hole this creates).
Plot hole: On arrival at the Summerland castle the Polar Bear King becomes human during the midnight hour (as part of the spell) and performs his husbandly duties with his carry-on wife. Why did he not become human during the journey from Winterland to Summerland which took several days? (00:32:40)
Plot hole: The helmet design is rubbish. The eyeholes are far too small - that close to the eyes the divider between the eyeholes would block almost a third of the wearer's vision. He would hardly be able to see what was right in front of him - and it is not too close nor too narrow to fall into the "blind spot" between the eyes. This is not a character error by Peevey - the helmet design came from the original plans - it is even shown in the German propaganda film!
Plot hole: When Frank gets the phone call that Bobby has been shot, all that is said is that Bobby has been shot on the street in Italian. They never said Richie shot him.
Plot hole: When Toby is checking everyone to make sure their costumes work, wheelchair-bound Bud is shown standing in a coffin-fixture. Since he was in the coffin costume, there was nothing there to be "holding" the character in a standing position, and he was obviously not in his wheelchair, as he is at standing height with everyone else.
Plot hole: It makes absolutely no sense that there would be over a dozen cops and soldiers in the lobby of the courthouse and leave only two cops to guard Lecter regardless that he was locked in the makeshift cell. Yes the plot needs a reason for him to easily escape but this still goes against every conceivable protocol for such a dangerous prisoner especially when there were dozens of armed personnel just in the scene alone when he was being transferred from the plane.
Plot hole: At the bar shootout where everyone except Marlboro and Harley are murdered, the two jump through the window, over the fence, into the airport, and into an airplane luggage compartment. They would have been caught by security. The missing, and dead, airport worker would have been missed and searched for, the gunfire would have attracted attention, and the police would have been called. They never would have left the airport.
Plot hole: Cady's plan to get revenge on Bowden includes raping and assaulting Lori. This part of the plan, however, hinges on Lori not reporting Cady to the police, which he had no way of knowing that she wouldn't. If she reported him, the investigation would have created huge problems for Cady. He bit off a chunk of her face, so the wound could have been matched to his teeth, as well the chunk of skin he bit off and spit out most likely would have had traces of his saliva on it. Not to mention evidence that could have been gathered from a rape kit and eyewitnesses that could have placed Cady at the bar with Lori beforehand (the bartender, for example). In all likelihood, he would have been arrested, tried and convicted. Lucky for him, Lori was too ashamed to report the incident.
Plot hole: How was Dolph able to start the car outside Yoshida's house after rescuing Tia? He didn't have a set of keys to that car, and he didn't hotwire it, so how did he get it started so fast, or at all for that matter?
Plot hole: When the police chief asks Joe 'where's the briefcase they were telling me about?' Joe tells him to look in the back seat of the white BMW. There are a couple of problems with this. First, the police chief is looking for a case with a bomb in it, because he received a phone call from the guy who had his BMW stolen. Even if he knew about the money, which is unlikely, the police chief has no way of knowing that the case he is about to open is not a bomb, since no-one saw Marcone steal the case with the bomb in it. Yet he opens it without calling the bomb squad. Second, Joe saw Jimmy put the case with the bomb in the back seat, so why doesn't he warn the police chief about it? (01:35:00)
Plot hole: No amusement park ride company would ever produce a prop scythe that was as sharp as depicted in the movie.
Plot hole: Laura moves to Iowa and rents a nice, large house, conveniently furnished with everything she could possibly need, by using a fake name, having no job, no established financial history, has no current bank account or credit cards, or any references. She merely hands cash to the agent to seal the deal. She later lands a job without proof of identity, citizenship (legally required), and has no references, no credible work history, or a different social security number. Laura is resourceful, but certainly lacked the illegal avenues to obtain a convincing fake identity and other false documentation. If she had been able to do any of that, then it would have to be incorporated into the plot as credible exposition. Movies audiences are sometimes expected to employ a "suspension of disbelief" for the sake of the plot, but this stretches credulity.
Plot hole: When Dr. Marvin is trying to get Bob to leave the night before his television interview, he can't leave because it's pouring rain. He also can't drive him because their car was left at the boat dock. However, Dr. Marvin could have easily called for a cab to drive Bob back to where he's staying.