Factual error: When Sweeney is sharpening his blades, most noticeably during the shaving contest, he is sharpening toward the blade, which you simply can't do with a razor blade and leather strop. A razor will slice right into the leather. He also doesn't even have the blade flat to the leather so again they're not remotely sharp as a sharp blade would easily sink right into the leather. Pirelli is using roughly the correct technique, even though they're trying to portray him as sloppy. (00:35:50)

Sweeney Todd (2007)
1 factual error - chronological order
Directed by: Tim Burton
Starring: Johnny Depp, Helena Bonham Carter, Alan Rickman, Timothy Spall, Sacha Baron Cohen

Continuity mistake: While Sweeney is upstairs with Pirelli, Mrs. Lovett gives Toby a meatpie downstairs. On a closeup, half the pie is gone, but when the shot widens right after, only a couple nibbles are gone from the cake.
Sweeney Todd: [Holding up razor.] At last, my arm is complete again!
Trivia: Even though they play mother and daughter in this film, Laura Michelle Kelly is only six years older than Jayne Wisener.
Question: In Mrs. Lovett's song "By the Sea," near the end she sings "Bring along your chopper!" What is the word "chopper" supposed to mean? Sweeney can bring his what?
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Answer: His knife/razor/sharp edge to kill someone with.