Other mistake: Based on the location of the barber's chair with the picture window in Todd's barber shop and the layout of the exterior of the building, there is no possible way that the chute behind the chair would be able to dump the bodies directly into the basement without going through the center of Ms. Lovett's shop.
Trivia: During its first month of production in London, Johnny Depp had to take a ten-day leave of absence when his daughter, Lily-Rose, was rushed to a hospital due to a severe illness (which was never disclosed by the media). To accommodate his absence, director Tim Burton filmed scenes that didn't feature Depp's character.
Sweeney Todd: You have a room over the shop, don't you? If times are so hard, why don't you rent it out?
Mrs. Lovett: People think it's haunted.
Sweeney Todd: Haunted?
Mrs. Lovett: Yeah. And who's to say they're wrong? You see, years ago, something happened up there. Something not very nice.