Actually, I'm pretty sure they don't announce the Japanese cast when it is dubbed. Depending on the theatre most movies are dubbed and often they work under the assumption if you are foreign you want the English (Japanese subbed) one. I saw HP 04 in Japan in Ikebukuro and most of the showings were in Japanese but they wanted to give me the one English showing and I was all nooooo cause I specifically wanted to hear the dub XD; My friend in 2002 saw HP:02 dubbed into Japanese there too. lol I'm actually surprised your Sweeney Todd was in English, but there is a lot of love for Johnny Depp and whoever you went with might have planned for the one subbed show.

If your theatre caters more to ex-pats it will be subbed but a general movie theatre most things are dubbed.

And no problem, I bought you oatmeal already :D