Post-striptease, Nikita and Michael apprehend the bad guy. They say they're taking him to the train station, in a hurry. The next scene arriving there, Nikita has had the time to completely change her hairstyle: in the bedroom where they apprehended him, her hair was unkempt, from having worn a wig during the cam-show. At the train station, just a few moments later, her hair is crimped and she is sporting bangs. This would have required a crimping iron, and taken quite a bit of time. Not only she didn't have the time---nor the tools---to crimp her hair, it makes no sense that a spy on a mission would care what her hair looked like and taken 30 min to 1 hour just to crimp it. (These hair errors would reoccur throughout the series.)
Nikita's snarky comment to Michael that she didn't think ANY of their professional existence was ever difficult for him is really out of line, considering that she saw him discover that his wife was still alive after three years believing the contrary, only to immediately see her die on another mission. That's over the line, even for her petulant nature.