When Capt. Picard is talking to Lt. Roe in the bar he tells her that there is only going to be six ships in the convoy and they could cut that number down if they had to but later when Data is talking Capt. Picard he says, "this is the convoy," and the camera changes to view the Long Range Scan 0128 and there thirteen objects with labels, nine white and four blue moving on the screen.
Picard tells Ro that two years ago, Starfleet would never have considered sending her on the mission at hand. She later tells the Maquis that she was released from prison three years ago because Starfleet wanted her to work for them in Bajoran matters. What Picard means here is that Ro would not have been chosen for this type of mission shortly after being reinstated by Starfleet, obviously because of its much more sensitive nature. In the meantime, however, she must have gained a lot of credit with Starfleet, which Picard suggests as well.
Ro says she was sent to the stockade on Jaros II after being court-martialed. This is not to be confused with Garon II, where the incident occurred that got her the court martial, as mentioned in Star Trek: The Next Generation: Ensign Ro.
In the opening battle with the Maquis, when the Enterprise disperses two of the ships with phaser fire, space appears to be shaking. This, however, seems to be a common effect whenever explosions occur, in order to simulate the shock wave.