When Maximus returns home to his fields, tractor tracks are visible in a field of wheat by the road.
Stirrups can be seen being used on some of the horses, even though stirrups were not developed until about 800AD.
Marcus Aurelius can be seen breathing when Lucilla greets Commodus as the new emperor.
In one scene we can see the river Tiber from the Colosseum, yet the Colosseum was in a position near one of Rome's hills from which no road led unblocked towards the river.
The audience in the Colosseum was segregated. Women, as the lowest class citizens, would have been on the top tier. In the film we see women sitting with the men.
During the first fight in Zucchabar, Maximus thrusts into one of the opposing gladiators. The sword is easily seen to pass between the man's side and his arm.
When Harry goes to take his seat after being sorted, he sits opposite Hermione. In the next cut he is seated beside her.
Harry's glasses sometimes have lenses, and sometimes don't, as do Dumbledore's.
On the train scene, the same hill as well as lake are seen multiple times.
Throughout the film, Frodo's fingernails are very bitten down and short, but a close-up when the Black Rider tries to sniff him out shows neatly manicured nails.
When Arwen rides through the river with Frodo on her horse, Frodo's head bounces unnaturally and is obviously a puppet.
When Arwen and Aragorn are alone together on a bridge in Rivendell, her lips are moving while he is speaking.
Forced perspective was not an option for the first group shot of the Fellowship at the council of Elrond, where the whole party had to be standing close together, so the Hobbits had to kneel to maintain the height difference. This makes their arms appear unnaturally long.
When Frodo trips and falls on the mountain, he reveals his prosthetic foot - it does not match the color of his leg and you can see the line where his real leg meets the fake foot.
As Frodo runs from the orcs, his cape is clearly supported by a string to make it look flowing.
When the fellowship is surrounded by orcs in Moria, Frodo's sword is not glowing as it should when any orc is nearby.
As Boromir lies dying, Aragorn leans over him. In the shots over Aragorn's shoulder, looking at Boromir, Boromir's right hand rests on Aragorn's left shoulder. In shots looking at Aragorn, the hand is not there.
The film takes place in the 1590s; yet, there are several references to tobacco plantations in America. There were neither tobacco plantations nor English colonies in America in the 1590s. The Roanoke colony failed in 1587, and tobacco monoculture did not begin in Virginia until the 1610s.
There are many discrepancies between the facts as portrayed in the movie and the known 'facts' of Shakespeare's life and work, including the order in which he wrote his plays.
The sound of the tambourine, played by Shakespeare with the musicians at the dance where he meets Viola, continues after he has stopped playing.
C-3PO sustains a dent on his head during the Sandpeople attack, but the dent appears, disappears, and swaps sides frequently during the movie.
Scenes from outside the Millennium Falcon indicate it has four windows, yet shots from the inside indicate three.
When Darth Vader releases the commander and he slumps on the desk, the force of the impact makes the whole set wobble.
When Luke is looking around the cantina at one point the small mousy alien takes a sip from its glass and totally misses its mouth.
A strip of desert is visible between the dock and the Titanic when docked at Southampton.
When Cal gets out of the car at Southampton dock, the scaffolding that is supporting the Titanic is clearly visible in the distance behind him.
When the Titanic is leaving, the newsreel cameraman is cranking the camera left-handed; hand-cranked cameras are all right-handed, but the scene was filmed mirror image and reversed.
Jack claims to have gone ice fishing on Lake Wissota, which wasn't created until five years after the Titanic sank.
Margaret Brown was never refered to as 'Molly' until after her death. While Old Rose's references are acceptable, since she'd be using the form the modern crew knew, Astor also calls her 'Molly' as she is coming to dinner.
Jack is supposedly held prisoner in the Master-at-Arms' office, which is depicted as having a porthole. On the Titanic, this room was an interior room and hence would have no portholes.
As the Titanic is sinking and begins to pitch forward, we can see passengers sliding forward across the deck. In one short scene, a few people hit what is supposed to be a large metal reel. When they hit it, it crinkles, revealing that it is made of foam.
During the overhead shot of the Titanic splitting in half a victim slides upward, defying gravity.
We are shown a shot of Rose's view of the Statue of Liberty from a ship, yet to obtain a view as indicated she would have to be on land.