When Doctor Crusher says that they "...won't have to worry past 70 below...", Picard replies that "It feels like that now." One would expect that if it feels that cold, their breath would be visible.
Trivia: Near the end of the episode, Dr. Crusher calls Picard "Jean" instead of "Jean-Luc." This is the only time she uses the shortened form of his name.
How is it with such advanced technology that they can't even keep 6-year-old boys out of restricted areas? Surely the computers can be set to only open the Observation Lounge for authorized personnel.
Portal: The universe exists to me to create life.
Picard: He has the right to meet death awake.
Crusher: Is that a male perspective?
Riker: What do you make of these?
Data: Crystalline. Mostly inert. Nothing to write home about.
Riker: Excuse me?
Data: Slang, sir. I did use it correctly, did I not?
Riker: Yankee Traders. I like the sound of that.
Data: Well, sir, I doubt they wear red, white, and blue or look anything like Uncle Sam.
Worf: Uncle who?
Yar: What have bright, primary colors got to do with anything?
Portal: Know your enemy and know yourself and you will always be victorious.
Riker: Fear is the true enemy. The only enemy.
Riker: He will triumph, who knows when to fight and when not to fight.
Picard: Sometimes the best way to fight is not to be there.
The stormy planet that the Away Team and the Ferengi beam down to was used, in various guises, in a number of future episodes and--due to its appearance--was dubbed "Planet Hell" by the production crew.
Wil Wheaton does not appear in this episode, but his character Wesley Crusher is mentioned that he is in his quarters.
This episode marks the first appearance of the Ferengi. They were initially intended to replace the Klingons as the major adversaries of the Federation (as the Federation and Klingon Empire were now friends). However, when they failed to live up to their expectations, the Borg were developed to take their place.
The Ferengi were initially conceived as key recurring opponents for the series, but it was felt that they came across too comically, so they soon evolved from the rather savage race presented here into the more comical, money-obsessed race typified by Quark in Star Trek: Deep Space Nine. The "main" enemy of this series turned out to be the Borg, introduced in the 2nd season episode "Q Who?".
Armin Shimerman, more commonly known as the Ferengi barman Quark on Star Trek: Deep Space Nine, makes a guest appearance as the Ferengi Letek.
The word "Ferengi" comes from the Afghani and Farsi word for "westerner" - "fereng." The writers intended Ferengi to represent western supposedly more material-oriented cultures: European, American, etc.