http://www.canada.com/globaltv/globalshows/et_story.html?id=59569db4-91a7-4a7f-adc2-130f17a08347 А если короче, то: "People have noticed that from the pilot to the series," Glau said. "We were experimenting with Cameron quite a bit early on. We wanted her to be able to seem human. We wanted especially for John (Connor) to be fooled by her, so he would let her into his life. And so, in the pilot, I do act very human. As I've gone through the series, I've taken steps back, though, and I'm acting more now like a terminator would. We did that for several reasons."
Короче - всё так и было задуманно.