When Data and Dr. Marr leave Engineering and enter the turbolift together, Dr. Marr orders the turbolift to the bridge. But when they get off, they can be seen walking into a section of corridor that doesn't exist on the bridge.
In the teaser, Riker asks Data what their best chance for cover is. Data's reply is "...subterranean caverns..." Since caves are, de facto, underground, Data has committed a pleonasm, which is a logical verbal redundancy, something his precise speech programming should not allow.
When Data and Dr. Kila Marr are examining the caves on the planet, Dr. Marr is holding her tricorder upside down all the time.
Riker: How do you know these metals will protect us.
Data: I am not entirely certain they will, sir.
Riker: I was afraid you were going to say something like that.
Picard: Doctor, the sperm whale on Earth devours millions of cuttlefish as it roams the oceans. it is not evil...it is feeding. The same may be true of the Entity.
(discussing Dr. Kyla Marr's dead son - Data has his memories)
Dr. Kyla Marr: A girlfriend? Oh, I never knew about that. Of course, the last person he would tell was his mother. What was she like?
Data: He enjoyed her kindness, her gentleness, her physical attributes.
Susan Diol memorably played Dr. Denara Pel on Star Trek: Voyager, the woman the Doctor rescued from the 'phage' and fell in love in with.
The cave set used here is a recycle of that used in "Final Mission."
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