How did Troi's hair become black with nice curls all by itself after it was gray and straight? There is no way hair can change color that fast.
Geordi's rank of Lt. Cmdr is shown on his uniform by two solid pips and one open pip. However, when he and Dr. Crusher are talking in engineering, his pips are backwards on his collar (two open pips and one solid pip).
At one point, Riker and Troi leave Ten Forward (Deck 10, Section 1), and enter a turbolift with a door label stating Deck 8.
Picard: You cannot explain away a wantonly immoral act because you think that it is connected to some higher purpose.
This is the second time we see an aged Troi. She also appears, although not as old as this, in "Future Imperfect."