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Incorrectly regarded as goofs
When the slave gladiators revolt and break out of the kitchen, they make for a tall wrought-iron fence. Each spindle in the fence is a single piece with a spear point at the top. The slaves manage to knock down a section of this fence, with about 10 pointed spindles. A number of them take up the section of fence and run at the guards. While it might be an interesting idea, as they run at the guards, the ones in their path just lie down. The section of fence passes over them and continues on. While the soldiers were never touched, they can be seen lying on the ground, making themselves as small as possible with their shields covering them, unwounded. They lay down before the fence hit them simply because they didn't want to be hit, and hoped to be spared the slaves' rage.
Antoninus is wearing trousers under his tunic when Tigranes enters the tent saying he arrived on horseback without any slaves. When Spartacus opens the treasure-chest Antoninus is suddenly bare-legged.
When Spartacus hamstrings the guard near the beginning, the guard hits him. When Spartacus falls down, there is an obvious jump cut of Spartacus changing position as he falls.
When Spartacus confronts Marcus Glabrus after the latter has been captured, the formed tears off Glabrus' medallion (which is the symbol of his office as commander of the garrison of Rome), breaking its chain. In the next shot Glabrus is shown wearing the medallion on its intact chain.
While in the senate house, during his appointment to head up the Roman Guard while Marcus Glabrus is dispatched to quell the insurrection, Julius Caesar is wearing the traditional white robe trimmed with a purple border, however when he walks out onto the steps with Gracchus he is wearing a gray robe trimmed with white vine leaves.
During the gladiator battle, the black slave just barely catches the right heel of Spartacus with his net, tipping him over. In the next shot, the net is tightly bound around both his knees.
Crassus appoints Glabrus as commander of the garrison of Rome to give himself power against the Senate. Rome did not have a garrison at the time of Spartacus because the Romans feared that troops inside the city could be used by their commander to overthrow the republic. It was not until Octavian created the Praetorian Guard that troops were permanently garrisoned in the city of Rome.
At the beginning of the major battle between the legions of Rome and Spartacus's army, one shot shows the Roman standard in centre-frame, with another at the extreme left of the screen. The Roman standard would contain the letters, SPQR - Senatus Populusque Romanus - but the one in centre-frame here clearly shows SPOR. There is no mistake of this in the restoration released on Blu-ray. Strangely, the standard seen at the extreme left has SPQR, with a small mark at the lower right of the Q which may have been a prop-master's afterthought. One is tempted to believe that all the props were manufactured with SPOR, and some changed at the last minute. But not the one in centre-frame as the battle begins.
Gracchus hands Batiatus two bags of money, with each containing 1,000,000 sesterci. The sestertius weighed .05 ounce and 1,000,000 would weigh 3125 pounds. Even if these were filled with gold aureus coins, each bag would still weigh 175 pounds.
Given his background Spartacus would never have learned to ride a horse, and certainly not as well as he does in battle. Romans kept their slaves away from horses as horses would have made escaping far too easy.
The narrator talks of Spartacus "dreaming the death of slavery two thousand years before it would actually die." But slavery did not (and has not) completely died; the reference seems to be to the (official) death of slavery in the United States in 1865.
When the slave gladiators revolt and break out of the kitchen, they make for a tall wrought-iron fence. Each spindle in the fence is a single piece with a spear point at the top. The slaves manage to knock down a section of this fence, with about 10 pointed spindles. A number of them take up the section of fence and run at the guards. While it might be an interesting idea, as they run at the guards, the ones in their path just lie down. The section of fence passes over them and continues on. While the soldiers were never touched, they can be seen lying on the ground, making themselves as small as possible with their shields covering them, unwounded. They lay down before the fence hit them simply because they didn't want to be hit, and hoped to be spared the slaves' rage.
This is a romantic allegory of 20th century social ills, using an ancient setting to make a point (see trivia). It is not a historical documentary, nor a biopic. Though many of the main characters were real people, they are used fictitiously, as explained in the ending disclaimer. Most apparent errors in costume, custom, design, dialect, politics, armaments, etc., are specifically exempt from this list for the same reason.
During the scene where the slaves are storming a wall, the slaves who die at the wall can be seen rolling under it to jump over again later.
During the final battle sequences the slaves drag down burning hay rollers. One of the slaves in Sparacus's army overshoots the end of the run and a Roman soldier generously drops his sword in order to catch him.
During the gladiatorial battle between Spartacus and the black gladiator, the sword Spartacus is using is clearly shown as a prop sword with a retractable blade.
As the gladiators revolt, a Roman soldier is killed, falls off a balcony and then crawls into a partially opened door below the balcony.
In the main battle scene toward the end, there is a soldier lying "dead" on the ground that clearly repositions himself as others fight around him so that he isn't stepped on.
A map of Italy can be seen in Spartacus' camp tent (it is prominently featured in the scenes involving the pirate emissary), which is far too accurate for the times of the movie.
A truck drives along the hills behind a battle scene.
Slaves digging with steel shovels of a pattern invented in the early 20th century instead of Roman wooden spades.
Slave extras wearing wristwatches and sandshoes.
Many of the horsemen use stirrups, an invention which did not reach Europe until about the 7th century A.D., eight centuries after the film is set.
Referring to leaving Italy by sea, several characters, including Antoninus, refer to the port of Brundusium. The actual port, in ancient times, was known as Brundisium. The discrepancy could be regarded as a variation in pronunciation, until the midpoint of the film, when the pirate emissary points to a map of Southern Italy in Spartacus's camp tent, clearly showing the misspelled city of Brundusium. The other cities on the map - Metapontum, Capua, Tarentum, for example - are historically correct in the Latin spelling of their names.
In their fight to the death after being captured by Crassus, Spartacus and Antoninus know that the winner will suffer a slow death through crucifixion and each tried to kill the other quickly. Both could have committed suicide with their swords or simply agreed to kill one another with simultaneous thrusts to avoid one of them being crucified.
In the baths, Crassus reminds Caesar that their families are both long-term members of the Equestrian Order and the Patrician Party. Both of these statements are incorrect. When the Equestrian Order was formed, only landed patricians were allowed admittance. By the time of the Republic, membership in the Equites was open to both patricians and Plebians, although there is no evidence that either man was ever a member. Additionally, Crassus was a Plebian, not a patrician. Although Patricians were considered nobles, many Plebians were active in the Roman government at all levels, including the Senate and Consulship.
At the start of the movie a guard says several times that Spartacus "hamstrung" a guard. The hamstring runs at the back of the leg from the top of the thigh to the knee. They show Spartacus biting the guard on the back of the ankle where the Achilles' tendon is.
Antoninus is described as a "singer of songs" and is asked to sing for the camp, but he merely recites a poem, with no musical aspect.
Gracchus makes the comment; "By the grace of god" when he should have said; "By the grace of the gods".