• Lucifer to Chuck - "One cosmic Band-aid on my knee and what? You think that we're even now?"
  

• Sam: "Maybe you could be a little less 'lordly?"
  Chuck: "But, I am...uh..I am the lord."

• Crowley to Dean - "Stealing my moves, Dean?"

• Rowena to Sam - "I'll turn you into a moose -- an actual moose."

• Dean to Crowley - You know, to be king again, maybe you need to remember how to be a soldier."

• Rowena to Lucifer - "You think you're the first man to try to kill me?"

• Dean to Sam - "First Cas is making kamikaze side plans, and now you?!"

• Amara to Dean and Sam - "Welcome to the end."

• What will happen if Chuck really dies?
  
• Will killing Amara be worse than trapping her, as Chuck and Lucifer have said?
  
• Are Lucifer and Castiel still alive?
• How did Amara get to Louisiana if she doesn't drive?

• According to Chuck and Lucifer, Darkness (Amara) and light must both exist for creation to be balanced.
  
• Michael is still alive, but in no condition to fight.
  
• Archangels are the stuff of primordial creation, and much more difficult to make or resurrect than normal angels are.
• Cas says that being Lucifer's vessel is destroying him.
• Sam made a secret deal with Chuck to bear the Mark of Cain without telling Dean about it.

• Sam's room at the bunker is #21.
  
• Grand Isle, Louisiana is a real place; it's in Jefferson Parish, Louisiana.

• "The enemy of my enemy is my friend." is an ancient proverb of uncertain origin.
  
• "Full House" was a 1980s era sitcom.
• "Together we can make hell great again." -- this could be a reference to a statement presidential candidate Donald Trump made repeatedly during his campaign speeches about "making America great again".
  
• Dr. Phil is a television personality who gives relationship advice.
• "The peanut gallery" traditionally refers to the cheapest seats in a theater. In some venues, hecklers or other unruly spectators may have occupied those seats.
• "Game of Thrones" is a popular HBO television series.
• "Musical chairs" is a child's game.
• "Band of Brothers" is a phrase from King Henry V's Saint Crispin's Day speech (from Shakespeare's play "Henry V"): "We few, we happy few, we band of brothers;
  For he today that sheds his blood with me
  Shall be my brother..."; The title for this episode is from the same well-known speech.

• "Day of the Eagle" - by Robin Trower (plays when Lucifer is sulking in Sam's room)

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EPISODE # 23 Alpha and Omega