You know... in the dozen or so times I visited Olvera Street, I never went into the old church. Although, I do admit, the one time I went there with my girlfriend she got creeped out. I'm not sure if you went into the building, but there's this one two story building which you go down to the old aqueduct pipe (it's located near the Avila adobe). While in that room, she was "pushed," however, at the time, she an I were the only people in that room and we were at opposite ends of it.
But anyways, thanks for reminding me.. La dia de los muertos is coming soon, and I've always wanted to check out the displays they put up at Olvera Street.