I can't speak to what happens when they get to real school since DS is in pre-k but I think the tv is significant. From my experience watching the little ones is that for those without a lot of other input from books or adult interactions, their play becomes proscribed by the tv characters. Even my kid with his incredible imagination and voracious reading when he used to watch more or watched certain contentless programming I noticed that it filled his play - now he would incorporate their info into his stories but I would if others kids have more difficulty doing it. So they get used to being told what play characters are and what their backstories are etc. Just a thought.

DeHe