The Princess and the Frog: Tiana • Louis • Ray • Dr. Facilier • Almost There Tiana • Prince Naveen • Platinum Tiana • Charlotte La Bouff At the end of the film, Mike brings Sulley (now the new CEO of Monsters, Inc.) a surprise, which turns out to be Boo's door reassembled. The door becomes functional when Sulley places the piece he has kept and he opens it to see Boo, who (although off-screen) recognizes him by happily saying, "Kitty!" This gives Sulley a surprised grin on his face as the film closes.

When Boo tries to open her closet door after Sulley tells her goodbye and closes it, she’s now 7% taller since the programmers noticed that she was too short. Mulan: Mulan • Yao, Ling, and Chien Po • Fa Li • Fa Zhou • Hayabusa • Khan • Cri-Kee • Little Brother • Mushu • Shan Yu • Captain Li Shang • The Emperor of China • The Matchmaker • General Li • Grandmother Fa • First Ancestor Fa • Chi-Fu • Great Stone DragonThe Little Mermaid: Ariel • Flounder • Sebastian • Ursula • King Triton • Prince Eric • Wedding Ariel • Vanessa • Flotsam • Amethyst Ursula • Ruby Ariel During the scene where Sulley and Mike hide Boo in the bathroom, one of the songs Boo sings behind the stalls is " Beauty and the Beast" from the animated Disney film of the same name. Beauty and the Beast: Belle • Beast • Lumiere • Cogsworth • Mrs. Potts • Chip • Maurice • Philippe • Gaston • LeFou

Sleeping Beauty: Aurora • Phillip • Maleficent • Flora • Fauna • Merryweather • Diablo • Samson • King Stefan • Goon • Owl • Rabbit Snow White and the Seven Dwarfs: Snow White • Evil Queen • Doc • Grumpy • Happy • Bashful • Sneezy • Sleepy • Dopey According to the artwork in the DVD, there are a bunch of drawings of Boo being slightly older (possibly around the ages 5–10) in her early works; but the final designs were later confirmed that Boo would be a toddler instead of a child. In the documentary with the characters, Billy Crystal, Mike's voice actor, said that Boo was an adorable 3-year-old little creation.There is also speculation that Bonnie Anderson from Toy Story 3 and 4 could be an older Boo due to having Sulley's colors and print decorating her bathroom and having a similar appearance. However, those rumors haven't been proven yet. Another scene in the film had Boo say to herself, "I'm Tigger!" Tigger is a tiger character from the Winnie the Pooh franchise. Alice Through the Looking Glass: Alice Kingsleigh • Dormouse • Tweedledee and Tweedledum • Cheshire Cat • Bandersnatch • Bayard • White Queen • March Hare • White Rabbit • Mad Hatter • Absolem • Time • Wilkins • Humpty Dumpty • Red Queen • Borogrove • Frog Delivery Man • Gentleman Fish • Vegetable Soldier • Vegetable Servant • Vegetable Executioner • Armored Chess Piece