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.

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: When Gypsy the moth spreads her wings throughout the movie, the number of yellow spots on her wings change.

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.

Factual error: In the opening scene, first shot, we see a bird fly left to right across a beautiful sky. A leaf falls into picture, causing ripples on water, a tilt-up revealing that we've been looking at a reflection on that water. The reflection of the bird was right-side up, but, as it is a reflection, the bird should have been seen as upside down.

Revealing: When Dot first talks to Flik, she is holding his telescope he made and in the reflection of the telescope you see the same part of a hill, no matter where she points it.

Continuity: You can see as PT Flea is walking away from the fly paper he has just torn himself off that the paper only just catches him on its edge as it falls, but when the shot goes back to where PT is floating in the water droplets, the burn mark around him on the floor is considerably larger than the area the fly paper actually fell on.

Continuity: After Tuck/Roll break off one of Hopper's antennae, they break off the left antennae, later when Hopper gets eaten in the fight sequence, the side of the antennae that is broken off changes back and forth.