Continuity mistake: When Leonidas, and presumably all the other Spartans, use their spears to clear their shields of arrows after the arrow shower from Persian archers, the tips of the arrows are still visibly left on all their shields. In the next shot, when the Spartans regroup for the Persian cavalry charge, the arrow tips are gone. (Granted, this is a highly stylized movie based on a comic book, but that does not change the fact that this is a continuity error.)
Factual error: Approximately 2 hours and 10 minutes into the "restored" full-length video version, there's a birthday party for little Lisa Dickinson, and the Alamo defenders sing "Happy Birthday" to her. The Alamo battle happened in 1836. According to David Ewen's "All the Years of American Popular Music," the song "Happy Birthday to You" was composed and copyrighted by sisters Patty and Mildred J. Hill, first as "Good Morning to All," in 1893.
Continuity mistake: It is 1940. Two pilots come out of a house - one of them has just lost his wife and family in the London Blitz, the other is an RAF Squadron Leader. The door they come out of has a modern electric bell push - a post 1965 version, white rectangular box with a round button.
Factual error: The third member of the Yankees with a prominent role in the film is Bob Cerv (roommate of Mickey & Roger). In the film, he is with the team from Opening Day. However, Cerv was actually acquired by the Yankees in May of that year.
Revealing mistake: When Natalie Portman's character is about to be executed, if you look at the wall behind the executioner, you can see a modern metal drainpipe.
Revealing mistake: The cannons shown are firing blank charges, which produce no recoil. Recoil has been simulated by towing the guns backwards when they fire. The problem is, there is always a distinct delay between the discharge and the "recoil." The cannon also seem to largely fire explosive shells. At no point do we actually see a cannon ball rolling or bouncing along the ground or into any group of soldiers.
Revealing mistake: In the scene after the battle of Agincort, where Henry and his retainers are walking meditatively among the heaps of the fallen, if you look carefully, you will see one of the fallen with his head raised watching the procession. He then realizes that he is on camera and puts his head back down. It's near the edge of the screen so may occasionally be cropped.
Visible crew/equipment: In the very first scene, the boom mic is very obvious at the top of the screen.
Factual error: When the camera took a shot on a train coming to a station in Czechoslovakia, you can see electric cables above the train tracks. There was no such thing in Czechoslovakia as electrified trains in the 1940's. The electrification started in the 1950's. (00:01:05)
Continuity mistake: When the stairs are first shown, there's carpet up the middle of the stairs. At the end when they flee the house it's gone.
Continuity mistake: At a meeting to do with the hospital's dealings, one man, Mr Broadbeck, objects to the Elephant Man being a patient in the hospital - in the beginning he is wearing spectacles, but, a few seconds later, the spectacles are gone.
Factual error: In the final scene where Solomon was reunited with his family, the doors he entered the room through had Edwardian style leadlight glass. The movie was set about 50 years before this style.
Factual error: Chuck Yeager's sidekick, Jack Ridley, appears in many key events which occurred after 1957, including the climactic 1963 test flight of the NF-104 plane that Yeager ejects from and is picked up by Ridley. Jack Ridley actually died in 1957, when the aircraft he was co-piloting crashed into a mountain in Japan.
Visible crew/equipment: While young Joan is lying in the field next to the sword, in the far right corner you can see a pair of legs and a camera lens pointed at the actress. (00:06:35)
Factual error: Morrison did finish film school in real life. He did not drop out as depicted in the film.
Other mistake: The Sydney harbor scenes have the backdrop of the opera house. The buildings (aka "The Toaster") beside the opera house were not completed until 1998. The film was set in 1976-77.
Factual error: In the scene where the young Helen Goff is traveling by train with her family, it's obvious that an American engine and coaches have been used, instead of a Queensland Rail locomotive of the era. None of the QR locomotives had flared smokestacks like on the one seen in the movie. The coaches are also incorrect - as far as I know, none of the Queensland Rail wood coaches had clerestory roofs with a set of windows in them like seen in the movie. When Helen looks out the back of the train, it's also obvious that the tracks are spaced at 'standard gauge' (4' 8.5"). They should be closer together, as railways in Queensland are built to 3'6" gauge instead. There is also no such company as the 'Queensland Victoria Railway Co', as marked on the coaches, as all railways in Australia are state owned.
Other mistake: In the opening scene of this German movie from 1944, a panoramic view of the city of Potsdam is shown with the subtitle "Potsdam 1813". In the background, the two high radio masts of the Potsdam Military Communication Central can be seen very clearly before the sky.
Continuity mistake: There is genuine wartime footage of Spitfires of the the right type for the period, but other scenes have later (maybe even postwar) versions flying about.
Factual error: Prime Minister Peter Stolypin is shown at the Romanov Tercentery, which marked 300 years of Romanov rule. Stolypin died in 1911, yet the Tercentenary was held in 1913. Also, Alexei's Spala incident happened in 1912, and was also shown after the Tercentenary.