Corrected entry: it is virtually impossible for a pig to look straight up into the sky. So it is hardly possible for Wilbur to be able to look up and see Charlotte on her web once, let alone the amount of times he freely does.
Corrected entry: It seems strange that Charlotte had to ask the other barnyard animals how to spell "terrific," given how articulate she was. (She had no trouble reading anything else Templeton brought to her and used words like "Salutations!" and "magnum opus.").
Corrected entry: Jeffrey, the gosling, is always following Wilbur around. So where is he after the fair, when Wilbur comes back heartbroken because Charlotte has died? They never show him again after the scene where the stuttering goose tells him he can't go to the fair too.