The filmmakers originally considered 27 different emotions for Riley, but ultimately trimmed the list down to the tight five we see in the film. Pride and Trust both got the ax. Ironically, Horror did not. (Source)

Joy's personality is so bright that she doesn't have a shadow. The other emotions do, although we can neither confirm nor deny that Fear is scared of his. (Source)

Small details in the film differ depending on the country of release. For example, in some countries, Dad daydreams about soccer, not hockey. In Japan, Riley's fine with broccoli; it's green bell peppers that gross her out. What's Japan's got against green peppers? (Source)

Flea, the bassist for the Red Hot Chili Peppers, voices one of the two Mind Worker cops in Cloud Town. Who knew Riley was so into '90s funk rock? (Source)