The webs keep disappearing, reappearing, then disappear again! Weird!

What the heck is up with that? Anyone notice this? They made several errors and it's very noticable when we see the 1st web up in the barn and then it disappears, then reappears between cuts. this also happens with the 'radiant' web. It disappears, then reappears for some reason and then is NOT still there after they get back from that fair! Also, wanted to point out Charlotte's web looks totally different during overhead views of the barn-most noticable during when she sings "we share the sun the earth the sky". Plus at the end when the new spiders make webs the webs change sides of the doorway on overhead views. Strange!