A number of items in the recently out Pixar’s Up trailer are being spotted that could possibly reference other Pixar works, reports UpcomingPixar. These include the Luxo ball, the toy airplane from Toy Story and also a stuffed toy bear which, the site suggests, could possibly reference to Pixar’s upcoming film The Bear and the Bow, due out in 2011. Apple has made available the new Up trailer in various formats, including HD. Up is slated for a May 29, 2009 release.