The Pixar universe is ever expanding with two Pixar films out in 2015, 'The Good Dinosaur' later this year and of course the wonderful 'Inside Out'. Something we all know is that Pixar like to leave little references and easter eggs for its fans to spot along the way. So i took the courtesy of picking a few of those out and sharing them here.
(Note: there may be spoilers and as the film is very recent, i was unable to get images of the easter eggs. So you'll just have to take my word for it)
During the film, the Andersson family have chinese food which is in a very familiar box.
This box has been seen in 'A Bug's Life', and is the same box Boo hides in in the restaurant during 'Monsters Inc' (another of Pete Docter's films)
The globe which played a very important part in the plot of 'Toy Story' when it knocks Buzz out of the window can be found in many places during Pixar's 'Inside Out'. You will see it in Riley's classroom and also Riley's teacher's headquarters at the end of the film.
La Luna Poster
A small poster in Riley's classroom resembling the lead character from Pixar short, 'La Luna' can be spotted on the wall just above the globe.
For The Birds
Continuing the trend of referencing its short film's Pixar includes this very clever easter egg indicating that even the short films are occuring in a simultaneous universe. As Riley and her family are driving to San Francisco the birds from Pixar short 'For The Birds' can be spotted on a telephone wire just as they are in the short.
The Good Dinosaur
'The Good Dinosaur' (Pixar's next movie) is referenced several times in 'Inside Out'. Firstly, and perhaps the most obvious of all, when travelling to San Francisco the family stop to take a photo beside a large dinosaur figure, which their car then rolls backwards into causing its tail to pierce the rear window.
In the classroom again, a student can be seen wearing a camo shirt, on which we can see a dinosaur figure amongst the patterns. (Worth noting that Toy Story characters can also be spotted)
There is also a dinosaur board game in imagination land.
The Memory Balls
Of course hidden amongst the memory balls there would be plenty of easter eggs. Firstly, scenes from Carl and Ellie's story from 'Up' can be seen in the balls as well as the famous Pizza planet truck slyly hidden in the background of our first meeting with Bing Bong. Finally, a play area which is identical to that of Sunnyside Day Care of 'Toy Story 3' can be spotted in one of the memory balls. Suggesting Riley may have been at the day care along with Bonnie.
It is worth considering however that the slide of the play set is not the same suggesting they attended the day care during different time periods.
Something else which links 'Inside Out' to the 'Toy Story' trilogy is that it takes place in Tri-County which can be seen in a banner behind Riley's hockey game.
Once again in Riley's class, an easter egg for 'Toy Story' can be found in the form of a t-shirt with a skull print, identical in all but colour to Sid's t-shirt from both 'Toy Story' and his cameo appearance in 'Toy Story 3'.
Finding Nemo (Find me box)
Just above the earlier mentioned Dinosaur game in imagination land, there is a box titled 'Find Me' with a clown fish on the front with a similar lucky fin.
This hidden easter egg is not a reference to another Pixar film but in fact a reference to another cinematic great Alfred Hitchcock, more specifically his classic film 'Vertigo' (a favourite of Pete Docter's). The poster for 'I'm Falling For A Very Long Time Into A Pit' is almost identical to the classic 'Vertigo' graphic poster.
The Luxo Ball
The Luxo Ball is a reference to Pixar's original short film and has become an iconic image in all Pixar films. It can be seen in 'Inside Out' bouncing down the stairs.
Destroying Disney (Cinderella Castle)
Perhaps my favourite of all of 'Inside Out's many easter eggs, during Bing Bong's tour of imagination land (as it is slowly taken apart during Riley's process of growing up) a clear reference to the famous Cindrella Castle of the Disney logo is being taken down and pulled apart by the construction workers of Riley's mind, acting as a beautiful metaphor for the loss of childhood and consequently an acknowledgement of every adult and adolescent's struggle to leave behind Disney and lose some of the magic of childhood.