Being a fan of computer generated/animated films, i watch them quite avidly, recently upon watching my collection of 'Pixar' movies again i had noticed quite a few reused objects and jokes.
I am going to watch each film again and note the recycled objects.
From first glances it appears that the most common would be the 'Luxo' ball, a direct reference to one of their first animated cartoons which centers around a small ball.
I have found this in 'Monsters Inc.' and 'Toy Story 1 and 2', so far.
Thus my research continues.
