Guinan discusses Worf's fondness for prune juice
The events that resulted in the birth of the character Sela were established in Yesterday's Enterprise.
The last battle of the Enterprise C is discussed at length.
John discusses this episode on the Trek Talk's phone line with Denise Crosby.
takes place on not-yet-named Archer IV
Captain Archer is put on trial on Narendra III.
The origin of the planet Archer IV is mentioned
Tasha recounts going back in time with the Enterprise-C
Castle quotes the "Let's make sure history never forgets the name Enterprise" line in the style of Captain Picard.