I have seen several good documentaries about the life of Lewis Carroll; this is not one of them, because it is filled with misinformation. For one example, every time the narrator discusses the family of Alice Liddell, a picture is shown of Carroll with the wife and children of George MacDonald, another Victorian author. Clearly very little research on Carroll himself went into this project, because it spends a lot of time focusing on assumptions that were made about the author long after he died. Also, a lot of time is spent trying to prove that Carroll had a tenuous grasp on reality, and this is treated as though it is a good thing. If you want a documentary with poor computer graphics and a lot of time spent off topic, this would be a great DVD. But if you actually want to learn something about Lewis Carroll, I recommend that you keep looking.
