Trivia: All of the creatures in baby Rapunzel's mobile are referenced later in the movie. The blue bird is the first creature she encounters after leaving the tower (it flies around her head when she sings "completely free"). There is also a white horse (Maximus), a chameleon (Pascal), a yellow duck (The Snuggly Duckling), and a cherub (the old man who dresses like an angel in "I've got a Dream").
Trivia: When Megamind as Bernard is in the library with Roxanne, the book he is reading ("Megamind Unmasked") has a description on the back of a self-help book entitled "The Happiest Me I Can Be". This is the same book that Metroman read (shown later in flashback) that caused him to decide to cease to be a hero. (00:43:30 - 01:08:30)
Trivia: In the scene after Hiccup finally gets Toothless' new tail fin to work, and the two are relaxing after they fly through the fire ball, the two are greeted by a group of tiny dragons. This little dragon was actually what Toothless was originally going to be, as he was in the book, until they changed him to a dragon big enough for Hiccup to ride to suit the movie. (00:46:15)
Trivia: Whilst this movie is a remake of the 80's Karate Kid, and is named the same, no actual karate is performed at all. It's all kung-fu.
Trivia: Alice's impending battle on the "frabjous day" with a creature referred to as a "Jabberwocky" is a central plot point, and refers to Lewis Carroll's famous poem "Jabberwocky," from which other characters in the film, such as the Jubjub bird and Bandersnatch, are derived. However, the titular creature of the poem "Jabberwocky" was NOT a Jabberwocky, but a Jabberwock. For whatever reason, the writers of the film chose to call it by the [admittedly similar] title of the poem instead of the actual name of the creature. (For the full text of the poem, see http://www.jabberwocky.com/carroll/jabber/jabberwocky.html).
Trivia: When Hobart falls off the fence when Ramona is mowing the lawn, he yells a Wilhelm scream.
Trivia: When Jackie confesses that he was orphaned and lived in a group home, this is true for both his character and in real life. Jackie's parents gave him up to the Peking Opera House because they could not afford to raise a child. There he learned how to sing and acrobatics along with his "brothers and sisters."
Trivia: Madame Varcolac's name is Romanian for werewolf.
Trivia: When a pine cone falls out of a tree and hits Yogi in the eye, a "Wilhelm scream" can be heard.
Trivia: When the orange dragon scorches the purple dragon to bones on the video game that Greg and Rowley are playing, you can hear the Wilhelm scream.
