New this week Character mistake: When the artifacts from the late 19th century, found in a cave, are identified by the away team, Data identifies the pistol as a "double action" Colt 45, circa 1873. The pistol is a Colt single action army, caliber .45. Certainly not a "double action".
New this month Continuity mistake: As Q approaches Picard and Riker's position while playing a trumpet, both of Q's hands are on the horn. A second later, his left hand is down by his side. Then, after he makes cigars appear in Picard and Riker's mouths, his left hand is extended as he says the first part of his lines. A second later, both hands are on his horn.
Other mistake: About two minutes into the episode, in a scene where Riker and Picard go to meet admiral Jameson in the transporter room, just as they are about to enter the turbolift Picard opens his mouth really wide as if making a funny face to someone inside the turbolift. Although it was filmed from the side it is quite easy to spot.