The Blu-ray release of the final Spartacus season contains Extended Cuts as well, this time actually for every single episode even though there are less differences than there were in the previous seasons. Besides more plot, there's more sex, more violence, more dialog and also alternate scenes. There's any possible difference in it.

The Extended Version of Episode 3.06 contains 3 more scenes with a total difference of 41 seconds.

17:56
Kore walks longer through the rooms towards the window. The TV Version features an alternative transition scene with Kore at the window. 7s
25,5s

25:30
Laeta, again among civilized Romans, is being washed longer.
10s

25:36
Ditto.
12s