When Riker first wakes from his coma, Crusher first wears a badge with four rank pins, then no badge, then suddenly a badge appears on her uniform.
When Riker is speaking to "Ethan" in the prison cell, the hand that he has raised flips between being his left hand, right hand, and back again between shots.
After Will awakes, Dr. Crusher asks the replicator for "Water, 3 degrees Celsius." There is no need to specify Celsius, as it is the standard scale for temperature in this time period.
As Admiral Picard talks with Captain Riker in the Conference room and says "Will, you're sound of mind and body. If you are properly briefed, you'll still be able to perform your duty," you can see either a gnat, fly or mosquito buzz around his uniform.
Near the beginning, when Picard, on the bridge, contacts Riker at his party to tell Riker to report to the bridge. Riker points to Worf and La Forge and the three of them leave. Riker doesn't acknowledge the captain's message to tell him that he is on the way. Not acknowledging messages is a frequent occurrence throughout the series.