A Bug's Life (1998)

Continuity: As Flik is just leaving the island to go find the "tough bugs", he's followed by two young male ants. The two young ants look quite different, one being blue and the other more purple. The blue one says "My dad gives you one hour before you come back crying" and the purple one says something to the effect of "My dad says you're gonna die". But after Flik has hit himself on the rock whilst trying to cross the valley, the purple ant says to the blue ant, "Your dad's right, he's gonna die". Wrong ant.

Continuity: In the opening sequence where the ants are loading the food onto the leaf, they show a panoramic shot of the scene, and you can see the queen and the princess standing under the shade near the center. But, in the very next shot, the ants are still hauling the food, and the royal family is no longer there.

Factual error: The size of the shadow of an object depends upon its distance from the light source, not the surface it falls upon. Lifting the cutout of the bird a few inches closer to the sun as they do would make absolutely no difference to the size of its shadow, yet it quadruples in size.

When they show the trailer where the to bugs go in to the bug zapper you can see the Pizza Planet Truck from Toy Story on the side of the trailer.

On top of the bar that Flik goes to, you can see the Pizza Planet Mega Gulp from Toy Story.

When Molt sheds his entire skin from being scared of the ants, the skin is the model that they use before they add the color.