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: During the attack of the fake bird, the ants and the circus bugs help things along by using berry juice to trick the grasshoppers into thinking they're bleeding. Insect blood is actually colourless.
Answer: For comedic purposes, it's impossible to find him.