In the first episode of the series (Welcome to the Hellmouth) Cordelia tells Buffy "we don't have a whole lot of town" yet in the episodes that followed we saw that Sunnydale has quite a lot to offer: A first class zoo, a major university, a museum that has natural history, archeology and precious gem exhibits, a multi-level mall, several major retailers including Starbucks, Ralph's, Old Navy and others, and a promenade with a nightclub and other entertainment facilities.
Michelle Trachtenberg (Dawn) has the last line of the series: "Yeah, Buffy. What are we gonna do now?"
Knowing that this would be the final episode, Joss Whedon included many references to previous episodes. These included: Andrew: A shout-out to my brother Tucker who gave me the inspiration to summon demons... Tucker summoned hell hounds to attack the prom in the episode The Prom. ---- Xander: See, I need a new look. It's this whole eye patch thing. Buffy: Oh! You could go with the full black secret agent look. Willow: Or the puffy shirt, pirate/poet feel. Sensitive yet manly… The last two times we've seen Xander in costume were a pirate in All the Way and as James Bond in Fear Itself. ---- Faith: Looks like the Hellmouth is officially closed for business. Giles: There is another one in Cleveland. We learn of the Hellmouth in Cleveland in the episode The Wish. ---- Giles: The earth is definitely doomed. This is almost identical to the final line of the episode The Harvest, which was the second part of the very first two-hour episode of the series. ---- Two of Cassie's predictions in the episode Help come true in this episode. - Buffy tells Spike that she loves him. Cassie told Spike "She'll tell you. Someday she'll tell you." - Cassie said to Buffy, "And I know that you'll go someplace dark. Underground..." This prediction was fulfilled when Buffy led Faith, Spike, and the Potentials into the Hellmouth. ---- A "Welcome to Sunnydale" sign gets knocked over for the third time in the show's history, having been also hit in School Hard (2x03) and Lovers Walk (3x08). Spike can be at least partially blamed for all three incidents.
In Chosen, everyone walks into a the school, ready for the final fight. That school is actually California State University, Northridge, located in the San Fernando Valley in California.
Buffy's final line of dialogue is "Spike."
At the end of the episode, when the bus is about to stop, if you look on the paved road, towards the bottom, you can see semi-circle tire marks, obviously made there from the bus in other takes.
When Buffy jumps onto the moving bus and turns around its clear she's wearing tan pointed high heel shoes, but when Buffy jumps off the bus after it comes to a stop we can clearly see she's wearing tan hiking boots.
When Vi leaps into the air and kicks-back a Turok-Han, she tries to land but you can tell she's strung up on a harness and wires because she seems to float a bit before her feet touch the ground again.
When the battle between the Slayers and the Turok-Han begins, Buffy kicks one of the uber-vamps in the face but her kick is surprisingly soft. You can tell she's trying not to kick the stunt actor - who portrayed the Turok-Han - in the face, her kick is also a little off.
When Buffy and co first look into the Hellmouth just as the Ubervamp army notices them, one of the Ubers in the centre of the screen has the prosthetic headpiece peeling off. The line between prosthetic and skin is very obvious.
When Buffy's escaping the High School before she runs up the stairs she's holding the top of the axe but when we move shots, she's holding the middle.
When Andrew gets out his paper with his speech on it, he is on the right side of Anya. When she grabs him to walk away the next scene show Andrew on Anya's left side...
Giles has a liking for Jaffa Cakes.
In the episode, we learn that Tara and Willow's long-absent cat, Miss Kitty Fantastico, may have been killed in some sort of mishap when Dawn left a crossbow lying around.
In the scene with the three Turok-han and the potentials, you can see a Turok-han holding a girl in a red sweater off to the right. But then in the next shot you see a Turok-han grabbing the girl as if for the first time.
Faith is recuperating in bed wearing the same clothes she had on when she was pulled unconscious from the water. It seems odd that apparently no attempt was made to get her out of her wet clothes and into some dry ones. With all the women in that house someone should have been able to spare a set of clothes.
When the girls are checking the wounded, the hole in the background is the same one in which Dawn, Tara, Willow and Xander hid in the episode Tabula Rasa (6x08).
On the Previously on Buffy the Vampire Slayer Scene it shows the Bombs Timer at 3 Seconds when Faith shouted get down whilst on the previous episode it showed 8 seconds.