Will Arnett is incapable of being a voice actor.
Todd Hansen and Chris McKay respectively as Captain Dale and Pilot Bill, the two pilots of the airplane hijacked by the Joker at the beginning of the film
 The film itself also serves as the first theatrically released animated feature to be based on a licensed property, which explains the lack of yellow Lego figures, despite Emmet Brickowski, the main character of the Lego Movie, making a small cameo

