The two main characters went through many iterations before they ended up as Buzz Lightyear and Woody.
Every couple of weeks, Lasseter and his team would put together their latest set of storyboards or footage to show the folks at Disney.
In early screen tests, Pixar showed off its amazing technology by,
for example, producing a scene of Woody rustling around on top of a dresser
while the light rippling in through a Venetian blind cast shadows on his plaid shirt
an effect that would have been almost impossible to render by hand.
Impressing Disney with the plot, however, was more difficult.
At each presentation by Pixar, Katzenberg would tear much of it up, barking out his detailed comments and notes.
And a cadre of clipboard-carrying flunkies was on hand
to make sure every suggestion and whim uttered by Katzenberg received follow-up treatment.
Katzenberg's big push was to add more edginess to the two main characters.
It may be an animated movie called Toy Story, he said, but it should not be aimed only at children.
"At first there was no drama, no real story, and no conflict," Katzenberg recalled.