Where Silence Has Lease - S2-E2
Corrected entry: Deanna is originally sitting on the bridge when they approach the zone of darkness, but after Picard tells Wesley to take them in, in the next wide shot Deanna disappears entirely and doesn't reappear throughout the rest of the scene - she only reappears much later when Riker and Worf return.
Where Silence Has Lease - S2-E2
Corrected entry: In this episode, the number of the USS Yamato is given as "NCC 1305 E." However, in the episode "Contagion," from later in season 2, the number is given as "NCC 71807."
Correction: The Yamato seen in When Silence Has Lease is not the real ship, but a replica created as part of a test for the Enterprise crew by the Nagilum - as part of the testing process, it contains numerous inaccuracies, such as being made from the wrong materials and has many alterations to the layout of the regular ship, including multiple versions of the bridge. The incorrect registry code is just one of these differences from the original. Later in the season, in Contagion, we see the real ship, which obviously carries the correct registry code.
Correction: Wesley also says it will take 12 minutes to intercept the "hole." When Picard says let's launch a probe, Deanna is already gone. Picard then says this is close enough, indicating they've intercepted it. So almost 12 minutes have passed, plenty of time for Deanna to leave the bridge for a number of reasons that are simply not addressed on screen.
Bishop73