Either the brig continues to be remodeled, or there is a continuity problem with respect to the controls for the force field that closes off the prisoner's cell. In this episode, a crewman sits at a control console & activated/deactivates the force field. In Star Trek: The Next Generation: I Borg, a crewman tapped a panel on the wall to operate it, and in an even earlier episode Picard himself was able to turn it on/off with a simple voice command to the computer.
Data states to Geordi that he believes he has experienced his "first emotion". This may be interpreted as untrue, because in Star Trek: The Next Generation: Déjà Q, Q gave Data the parting gift of laughter. However, Data was not given an accompanying emotion in this episode, only the sensation of laughter, therefore he did not experience actual emotion until the fight.