If there's one thing animated movies have over their live action counterparts it's their ability to craft a meticulous attention to detail in which everything that appears on screen is there for a reason. Of all the animation studios out there, Pixar has justly earned a reputation for cramming in a wealth of hidden details for the eagle-eyed viewer to spot. Counting up all the easter eggs in Pixar's filmography is an immense task - considering that they already had several movies in the pipeline from day one, it's understandable that right from the beginning they found the time to populate their films with little visual touches referencing back and forth across their body of work. From the frequent appearance of the phrase A113, an inside joke referring to the classroom in which John Lasseter, Brad Bird and other Pixar staff were taught at the California Institute of the Arts, to the regular voice work of John Ratzenberger, affectionately known as "Pixar's good luck charm", the nods and winks come thick and fast. Covering each and every one of them would be a difficult task, so instead we've narrowed the selection down to 30 of the best easter eggs which tie the Pixar universe together. Are there any here you missed?