There are manny hidden names in Toy Story:
1. (this can be seen when Buzz and Woody are chasing the truck) The name of the moving company is Eggman Movers. This is in honor of Art Director Ralph Eggelston.
2. (this can be seen after Sid comes home from Pizza Planet) on Sid's backpack, the words "Julie Macbarfle has kooties". This is a reference to Julie MacDonald, one of the editors of the film.
3. (this can be seen when Buzz and Woody are chasing the moving truck) The liscence plates of one of the cars reads "MOLYK9", in honor of Pixar's resident sheepdog.
4. On the for sale sign in front of Andy's house, it says "Virtual Realty" (OK, that's not really a hidden name, but it's still interesting)