In the Astrometrics lab as Seven and Harry observe happenings on the holodeck, Harry adjusts the controls to view Chaotica's fortress. An exterior shot flashes briefly on the screen (before cutting to an interior view of the fortress). The fortress exterior appears in perfect condition, even though it was previously shown to be heavily damaged. Later on, it is shown damaged again.
Paris introduces Tuvok as "Lieutenant Tuvok" rather than his actual rank of lieutenant commander.
While Paris is explaining to Janeway what she will need to do in the simulation he mistakenly says "Once you disable the death ray message me in my ship". Janeway is there to disable the lightning shield, not the death ray.