When Riley runs away from home she leaves in the morning and begins walking to the bus stop. When her parents arrive home that night to find her missing she is still walking to the bus stop, approximately 6 hours later.
When Joy and Bing Bong are trapped in the disposal, Joy takes the memory of the team celebrating Riley from the ground, even though it should be in her bag and was never taken out of it in this context.
Right at the beginning of the movie when baby Riley appears, her mother appears to be wearing glasses. When the mother is visible from Riley's point of view, the mother has no glasses.
In the Swedish version Riley's name is Jenny. When at Dream Productions they try to give "Jenny" a nightmare, the director says that they're trying to wake her up. However, in the Swedish version, the director says that "they're trying to wake Riley up", instead of Jenny.
When Joy, Sadness, and Bing Bong are about to enter Dream Productions' Stage B, a flashing light above the door can be seen. After Bing Bong is arrested and Joy and Sadness exit the theater, the light is gone.
In the opening scene, the newborn Riley sees her parents in full-color. Human infants are born colorblind. The retina's cone cells (ergo, the ability to see color) don't fully form until infants are about 3 months old (assuming they're going to have full trichromatic color vision). However, if human infants are born colorblind, that means they grow up to be colorblind.
During dream production, when Riley is dreaming that her teeth are falling out, a production worker is dropping "teeth" in front of the camera. Since the camera is supposed to show Riley's point of view the falling teeth shouldn't be seen by the camera.
For some reason, Joy had the ability to cry when she thought that she wasn't going to make Riley happy again.
However, other emotions can feel emotions. Sadness reacts with joy when she and the others board the train of thought.
However, other emotions can feel emotions. Sadness reacts with joy when she and the others board the train of thought.
Sadness's glasses have no earpieces, yet stay on throughout the film. Given that everything about the character design of the emotions is stylized, there's nothing wrong with this.
When Riley and her mother discover that San Francisco has one type of pizza, Anger states that both Hawaii and San Francisco have ruined pizza, whereas, in fact, it was Canada that invented the Hawaiian pizza. There is a possibility that Riley did not know this fact.
It's unknown if Joy and Sadness told the other Emotions about Bing Bong. It's also unknown if Joy told them that Bing Bong sacrificed himself to help her get out of the Memory Dump. Fear knows about Bing Bong and told Anger and Disgust about him, but Anger doesn't listen or care.
When Joy says "We can get a recall.", Sadness is mouthing Joy's lines.
Most of the memories shown are from a third person view, while others are first person, as they logically all should be.
In the UK release of the film, Riley's father daydreams about football (soccer) instead of ice hockey. However, given that Riley still plays hockey in that version, there was no real need for the change, especially as in a film set in the US it would be more usual to daydream about a predominantly American sport.
While it makes for a humorous moment, there is no way Riley (and her emotions) wouldn't have known about the big move from Minnesota far earlier than depicted. She would have known long before that she would be moving to a new home, new school, new hockey team, etc. so the idea that she and her emotions are caught completely off guard are is far-fetched.
At the beginning of the movie, Joy said that she and Riley were alone for 33 seconds. However, they were actually alone for more than a minute.
If its possible to send memories directly up to headquarters like how the workers sent the triple dent gum commercial memory up there, Joy could have just done that with the core memories, essentially solving half of the movie's conflict.
Joy and Sadness are pulled through a return tube and dropped into long term memory. Through the entire trip they pass numerous recall tubes with no idea to use, until one breaks open when Honesty Island is destroyed.
During the credits a couple of girls are insecure, but this emotion has not yet been introduced and is absent.