Despite having awful tan lines, Kiyone gets plenty of cheers from the crowd when she's on display for a beauty contest. For a character that has to put up with Mihoshi and is kind of a Chew Toy, it's nice to see her get something good. There are even tears in her eyes.
The final scene between Tenchi and Ryoko, in "Tenchi Forever", mirrors the one between his parents at the end of the first film ("Tench in Love") - from the location to the dialog, and ends with a sepia toned still frame of them together (from 2:10-3:43).
The final scene in Tenchi Universe, in which Ryoko is revealed to have survived and that she is now back on Earth to claim Tenchi for herself.