Beyond the advanced knowledge that was given out to the Barkonians, the crew also violated the Prime Directive by the creation of Data's advanced microscope that was never shown to have been collected by the crew of the Enterprise. It had the magnification power of 500x which wasn't achieved on Earth until the late 17th and 18th centuries.
Trivia: Deanna Troi is promoted to the rank of full Commander.
After Data loses his memory, he can still function and communicate. Why doesn't he know what "radioactive" means?
When Deanna takes the test the final time she enters the frozen Engineering section but you can see the simulated warp core's lights moving in the reflection of the panels.
Talur: I'm sure my grandmother would have called our friend here a demon or a spirit or some sort of monster. But current scientific methodology allows us to dismiss such ridiculous superstitions and concentrate on scientific reality.
Data: Then what do you believe I am?
Talur: You are an ice man.
Data: Counselor, have you been promoted in my absence?
Deanna: That's right. Which means, from now on you can call me 'sir'.
Data: Yes, sir.
This episode was nominated for an Emmy for Outstanding Individual Achievement in Art Direction for a Series.
Patrick Stewart has only one line in this episode which was, "What's the last thing you remember?" Patrick Stewart also appears on screen in this episode for less than one minute.
In addition to Picard appearing only briefly, Worf and Geordi appear only as part of a holodeck simulation.
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