I don't have a good answer to your question about how many people may have evacuated inland, but I caught one comment the other day. I forget if it was from TV or a news article.

A person was saying that the government had warned them of a dangerous "storm surge," which is not a particularly familiar term for them. The same person was saying if the government warnings had mentioned the word "tsunami" then everyone would have understood the magnitude of the danger involved. These people ride out typhoons all the time, so I don't think the extreme danger of Typhoon Haiyan was effectively communicated to the people.

Pacific typhoons generally are not as strong as Atlantic hurricanes so a high, sustained storm surge is less of a concern there than here in the US, which is probably why the term is not so familiar there.