Alternate Show Interpretation: The 2005 Broadway revival, in which all of the characters are portrayed as inmates enacting the events in a madhouse.
The 2012 West End production gave a Setting Update by placing the show in the 1930s.
Alternative Character Interpretation: All over the place. Toby, for one. As the role is vocally demanding, adults are often cast in the part, which makes for the question of whether Toby is a kid or a mentally disabled man. For that note, the motives of the Beadle are ambiguous, whether he's a psychopath who's as bad as the judge or just a police officer who sincerely believes the judge is a good man. Then there's the matter of whether Anthony is a romantic hero who saves Johanna from the Judge or if he's a creepy stalker (though he's definitely a major step-up from Judge Turpin).
Johanna can also be interpreted as genuinely in love with Anthony or just using him as a means to escape the Judge. The 2007 film, for example, went with the latter.
Judge Turpin, of all people, gets one depending on whether his song "Johanna" removed or not (that being said, it is so often removed foragoodreason). This song shows that he actually tried to resist the temptation Johanna was causing and even seems to imply that she was his Morality Pet. "Johanna, Johanna, I treasured you in innocence and loved you like a daughter".
Does Mrs. Lovett genuinely care about Toby or just as uninterested in him as she is with everyone else other than Sweeney?
The 2014 concert hinted that Toby might be romantically interested in Mrs. Lovett and additionally featured a scene where the Beadle hits on her.
Awesome Music: "The Ballad of Sweeney Todd", "Epiphany", and "A Little Priest", just to name a few. Well... really the entire song list (given the right cast) but bonus points go to "Johanna (Reprise)".
Deliberate Values Dissonance: The judge's sentencing of a young boy to hanging, though he is a four-time offender. The musical obviously wants to criticise atrocities committed in the name of the law that were acceptable back then, as children were treated the same way as adults. This is noticeably shortened to one previous offense in the film to make it even worse.
Ear Worm: Just try to get ANY of the songs out of your head after viewing the theater or movie version. It's bloody impossible (but delightfully so).
Ho Yay: In the movie, there seem to be overtones of this between Beadle Bamford and Judge Turpin. Mostly coming from Bamford's end, though it IS kinda odd that he seems to spend so much time with the judge...
Notably, in the stage musical it's made clear in the reprise in The Barber and His Wife that both Turpin and Bamford have a thing for Lucy. In the movie, however, the lyrics are changed so that only the Judge's affections are mentioned.
Narm: Toby reciting pat-a-cake before slitting Todd's throat can be this if not executed properly.
Paranoia Fuel: A trip to the barber's or a pie shop both made very creepy for the Victorian audience. For the typical modern audiences, this story has made the straight razor unsettlingly best known as a weapon of murder.
The finale reprise of "The Ballad of Sweeney Todd" invokes this trope with its lyrics, culminating with the company shouting "There he is! It's Sweeney!" and pointing out at the audience.
Perhaps today, you gave a nod
To Sweeney Todd, the Demon Barber of Fleet Street?
On the other hand, another way to see them is as a parallel to the Todd/Lucy couple ("she was beautiful, and he was naive", particularly if you take the interpretations where Johanna is crazy into account)
Squick: The whole thing is pretty squicky, but Judge Turpin gets a special mention for "Johanna (Mea Culpa)," where he flagellates himself to orgasm while watching his teenaged ward through a keyhole. While singing. It was cut from the original Broadway production, and, unsurprisingly, it's only occasionally reinstated. When done well, the sequence can be one of the most chilling in the show...which is about serial murder and cannibalism.
Anthony when he bursts into Sweeney's barber shop in the midst of his shaving of Judge Turpin. What was he expecting?
One wonders why Sweeney takes Lovett's advice to be patient in plotting his revenge at heart, spending his sweet time singing along with Turpin about pretty women. What was he expecting? Although... see "Squick" above.
Mrs. Lovett, keeping Lucy a secret from Todd when she kept coming around her shop. Sweeney's shown no hesitation in killing anyone who's crossed him, particularly in regards to his family. What was she expecting?
Pirelli, confronting a man who's been in prison for fifteen years, and blackmailing him. What was he expecting?
Awesome Music: Not sure about the original musical, but the quiet interplay between Turpin and Todd in "Pretty Women" is incredibly good, especially as it builds to that crescendo at the very end.
Complete Monster: Judge Turpin is a corrupt Hanging Judge in Victorian London and the man who begins Sweeney's start of darkness when, lusting after the then-younger barber's wife, Turpin has him imprisoned on a penal colony for decades of hard labor so he can seduce his wife. When she refuses, Turpin has her lured to his home under pretense of offering to free her husband- but rapes her instead, and steals her daughter as his ward. Turpin guards her jealously, having a younger sailor brutally beaten for looking at her and plans to marry her himself. When she refuses and tries to run away he sends her to an asylum where he knows she'll be mistreated. At another point, Turpin sentences a little boy to death by hanging...and then asks his sidekick, the Beadle Bamford, if the boy was even guilty of anything.
Ensemble Dark Horse: Helena Bonham Carter as Mrs. Lovett, Alan Rickman as Judge Turpin and Timothy Spall as the Beadle all by virtue of giving better performances than Johnny Depp as Sweeney Todd.
Genius Bonus: Pirelli boasts that he had Shaved the Pope himself, while mocking Sweeney that probably thinks it was only a Cardinal, followed by Toby showing a portrait of the Pope. Given that the story should take place in 1846, it was the same year that Pope Pius IX was elected Pope, which would explain how Pirelli might have really shaved the Italian cardinal Giovanni Maria Mastai-Ferretti who became the Pope, giving him the edge by technicallity.
Although the written "Thanks for da Shave - The Pope" on the portrait is rather suspicious on Pirelli's part. Not to mention that we later learn Pirelli is a false identity, giving further evidence that it was all just made up.
Hilarious in Hindsight: When the movie came out, it was noted that there were three Harry Potter alums in the film. The actor who played Anthony later played Grindelwald, so that's four. Not to mention that three of the four played Death Eaters, and all their HP characters were, at one point or another, bad guys. Dark Wizard reunion!
Love It or Hate It: Critics, general audiences, and Sondheim, who was heavily consulted, himself love the film, but some serious fans of the stage show despise it. The main reason for the divide comes down to the performances, with fans of the film loving the actors in it, and haters feeling they're butchering Sondheim's score.