In the battle scene in the movie Spartacus, what completely out-of-place object made an appearance? (It wasn't taken out until technology was good enough to be able to take this object out.)

DIdn't a truck roll past
in the background?

(only.... I am dogspit LOL)

Sorry, dogspit. Something else happened.

Try again!

In addition to the truck there
were also soldiers in tennis
shoes and watches. This film
seems to be a flub magnet.

That's also true (and there are a lot of mistakes in the movie). However, I was referring to a specific object that appeared during the battle scene (where the Roman army is marching in formation against the slave rebels).

One more guess... then I'll reveal the answer.

One more day for someone to try an answer...

Hmmmm, read at one site that a
jet contrail appears in one
scene (though it doesn't say
which), so that will be my
final totally uneducated guess.

?