When the station officers discuss Nog's dependence on Vic Fontane, Lt. Ezri Dax' insignia change position. In the first three shots of her, the full one is on the left side of the black one. In subsequent shots they take their correct position. (Normally the full insignia are to the right of the black ones, which are similar to the half-stripes used in the US Navy for the ranks of Lieutenant J.G. and Lieutenant Commander.) See more
[in the holosuite as Nog tries to get Vic's program running
You know... Vic's matrix is a little different than your standard photokinetic hologram. He can turn himself off. And if he doesn't want to appear... he doesn't appear
You mean he has free will?
I'm an engineer, not a philosopher. All I know is that when Vic turns himself off, he's off, and ripping out the guts of the holosuite isn't going to change that.