Julia Hoffman, who has her own not-entirely-reputable reasons for "curing" Barnabas this time around. See Sequel Hook.
Angelique was a much more tragic figure in the original series than the the malicious bitch in the film. For starters, she only cursed Barnabas after he SHOT her in the original show, with the implication that she was not in her right mind, especially since she initially tried to undo the curse when she got better. She also did not murder Barnabas' parents, or curse Carolyn. Even though Angelique was responsible for Josette's death in the original show, she did not sadistically force her rival to kill herself against her will. She merely showed Josette an image of herself as a vampire, causing Josette to willingly commit suicide in horror. It was never clear if her intention was to kill Josette or simply scare her, though she was happy with the end result. Also, Angelique herself had been murdered when it happened, so it could be argued that she was not in her right mind.
Barnabas seems to have dealt with this nightmare by obtaining a twisted sense of time while he was imprisoned. The second time he's imprisoned in a coffin, however, he believes it has been years or decades while he was only trapped for twenty minutes.
Apologetic Attacker: Barnabas apologizes both times before murdering two packs of innocent people. He voices regret to at least one of construction workers, but explains that after 200 years, he's very thirsty.
As Himself: Alice Cooper - though nobody accounts for why he looks 40 years older than he should have been. A bit of Self-Deprecation there: Cooper's cameo was originally supposed to be a CG representation of his younger self, but Cooper thought he looked uglier then than he did now, and decided to stand in himself.
Auto Cannibalism: Well, at least, drinking your own blood. When Barnabas drains Dr. Hoffman, she is transfusing herself with a bag of his blood, which quickly empties.
Barnabas: A stout man contains some 5 quarts of blood, which if you will forgive the boast, I can consume in a mere seven and a half seconds. But you, my dear little wisp, I dare say I will drink you to a withered husk in less than five.
Badass Family: The Collins all stand up against Angelique in the climax, with all their dark secrets.
Bastard Girlfriend: Angelique kills Barnabas' parents and girlfriend and locks him in a coffin for close to two centuries. Doesn't prevent him from being attracted to her.
Beat Still, My Heart: As Angelique is defeated by the ghost of David's mother, she plunges her hand into her shattered chest, pulls out her still-beating heart, and shows it to Barnabas in a last desperate attempt to make him feel something for her. It doesn't work, the heart evaporates and she dies.
Bedsheet Ghost: Double Subverted. The first time Victoria sees a "ghost", it's very obviously David trying to scare her. The second time, when she thinks it's David again... there is a very real specter underneath the sheets. She's neither surprised nor scared though, since she's known this ghost since her childhood.
Although unlike the original series it's always obvious that there was never a choice to be made there unless he gave into Angelique's blackmail; although he's incredibly physically attracted to her he also openly loathes her as a person.
Bittersweet Ending: Angelique is dead and Barnabas succeeds in turning Victoria/Maggie into a vampire so that they can be together forever, but Collinwood Manor and the fishery are burned to the ground and the Collins family are now even less liked by the townsfolk.
Black Comedy: What this mostly is, though there's also tragedy, horror and romance elements scattered throughout.
Blessed with Suck: Maggie, whose ability to talk to ghosts is misunderstood by her parents, leading to her institutionalization.
Brick Joke: In the movie's prologue, the "M" in Mephistopheles' name looks suspiciously like the McDonald's "M." After Barnabas is unearthed in 1972, he looks up and exclaims "Mephistopheles!" as he sees a McDonald's sign.
Composite Character: This film's Victoria Winters is both the original Victoria and Maggie Evans. Serves as a Mythology Gag as during the original series, both characters were identified as the reincarnation of Josette at different times.
Also, Angelique is both the original Angelique and Burke Devlin, who, in the first season of the original series, was building up a rival fishery to bring down the Collins family out of revenge. Of course, having had 200 years (and magic), Angelique is far more successful.
Barnabas. Sure he can't endure sunlight, but he's gained immortality and vampiric powers.
Carolyn, who's been turned into a werewolf.
A Date with Rosie Palms: While arguing at the table, David mentions that Carolyn touches herself and moans 'like a kitten'.
Hilarious in Hindsight considering what Carolyn morphs into during the climax. In fact, arguably it's more than just irony; Carolyn may actually have been making those noises because she was transforming...
Death Glare: Angelique does this many times. As does Barnabas when he's really mad at someone.
Destructive Romance: Angelique's desire for Barnabas is ultimately what breaks her and leads to her demise.
Destructo-Nookie: Barnabas and Angelique trash the latter's office while making love.
Deus ex Machina: Not that David's mother's ghost doesn't get mentioned at all before her climactic appearance, but considering that ghosts aren't seen to be capable of doing anything apart from being seen and that she only appears at the climax it's hard not to consider her sudden appearance this.
Diegetic Switch: The restoration of Collinwood and the family business is accompanied by a "Top of the World" soundtrack by the Carpenters. The scene eventually switches to a Collinwood TV set showing Karen Carpenter performing the song. Aghast, Barnabas attacks the TV, crying out, "Reveal yourself, tiny songstress!"
Played with in an earlier scene, when Barnabas, monologuing about his past, lays his arms on a '70s home organ, which plays a moody chord with inappropriately bouncy auto-accompaniment. Subsequent gestures generate ScareChords and other out-of-place sounds, until Elizabeth finally switches it off.
Dug Too Deep: Barnabas is released when his coffin is dug up by construction workers.
Electric Torture: Maggie was treated by electroshock therapy when she was confined in a mental hospital.
Emergency Transformation: Barnabas bites Maggie and transforms her into a vampire to save her from a fall off the cliff at the end.
Engineered Public Confession: Angelique records Barnabas' confession of killing the construction workers and the hippies, and plays it out loud to the crowd gathering near the burning Collins factory (which she destroyed using black magic).
Europeans Are Kinky: Angelique has French origins, and boy is she straightforward in sexual matters.
Evil Versus Evil/ A Lighter Shade of Black: Barnabas and Angelique are both clearly evil. Murder, mind-control, vicious mindset, and so on. He consider himself to be the lesser evil, arguing that all the bad things that she does are her own fault... while all the bad things he does are also her fault, since she's the one who turned him into a vampire. See also the Protagonist-Centered Morality example.
Fake American: Played with and justified in-universe. At the beginning, Angelique speaks with a French accent, but develops an American pronunciation to help her blend in the ever-changing society. Barnabas, on the other hand, missed out the last 200 years of the language's evolution in America, and still speaks like a Brit. It helped that his cover story was that he had just recently come from Britain.
Helena Bonham Carter plays this straight and does an excellent job with the accent. Ditto Bella Heathcote.
And Jonny Lee Miller.
Faked Rip Van Winkle: At the second time Barnabas Collins got out of a coffin he was sealed in, he was ready to believe he'd been there for decades. (Justified in that it took him 196 years to get out last time) The trope was averted as a relative of his tells him he was only there for a few minutes.
Foe Yay: invoked Stacks of it with Barnabas and Angelique. They hate each other, but quite obviously lust for each other.
Foreshadowing: Carolyn being a werewolf: The first time we see Carolyn she's wearing a very short dress and throughout the whole film Does Not Like Shoes (when she transforms her legs change so much they rip her tights); the second time she's eating under a painting of a full moon and her cousin says she makes animal noises at night. Angelique also refers to her as a "fetching creature".
At one point, mention is made of the family curse: witches, vampires, and werewolves.
Dr. Hoffman becoming a vampire : She's always wearing red and she's always thirsty.
After the transfusions begin she also stays away from the light and asks people to shut the curtains. She also gets noticeably paler, and when Barnabas bites her and she gasps in pain it's shown she has fangs.
Genre Blindness: You'd think all that everyone'd know that Barnabas was a vampire after he mentions that his hand should've burst into flames by touching the silverware and his declaration to focus his attention on family after 200 years at breakfast, or at least MAGGIE would've figured out it out after deep-kissing the damned guy, but you'd be wrong.
Identical Grandson: Maggie is probably a descendant of Josette's family, hence the resemblance between the two and the fact that Maggie can see the ghost of Josette.
This trope is toyed with as well. Angelique does not age, so to avoid suspicion she pretends to be her own daughter, granddaughter, great granddaughter, ad nauseum as time passes. This causes the boardroom of identical portraits in the gallery of past CEOs.
I Have You Now, My Pretty: Probably what Angelique was thinking when she locked Barnabas in that coffin; the first and second time.
Immortality Immorality: Angelique is over 200 years old, perpetually young, and deeply depraved. Barnabas, although much less of a jerk, still uses very immoral methods (mind control, killing, etc.) to further his agenda.
Impoverished Patrician: The Collins family fell on hard times and couldn't even afford to keep the whole manor warm until Barnabas Collins showed them the secret compartment where his parents hid their valuables. It's unclear what became of them after the climax.
Though the treasure room was below ground and seemed framed by stone, so it had a more than decent chance of surviving. Certainly enough to work with if they ever decided to capitalize on the Sequel Hook at the end.
Julius Beethoven Da Vinci: Played with. To cover up her immortality, Angelique always poses as the head of the Bouchard family, changing names and appearances every generation or so.
Just for Pun: Carolyn, who is a werewolf spends much of the movie acting bitchy.
Just Train Wrong: An amusing example in the opening credits: While the interior of the Amtrak train is correct, even using old advertising and Amtrak's original logo, the exterior shots are of a modern-day train.
Line-of-Sight Name: Maggie Evans thinks her real name will not impress the Collins so she looks for another name, sees an advertisement for the Winter Olympics in Victoria, British Columbia, and renames herself Victoria Winters.
Literally Shattered Lives: Angelique seems to be made of some sort of ceramic and shatters progressively during the climatic fight. It's implied that her immortality has to be renewed in cycles, since she survived being slammed around a bit by Barnabas earlier.
Living Statue: In the final showdown, Angelique's sorcery animates the wooden carvings in Collinwood estate.
In that same battle, Angelique takes on this appearance, with her porcelain-like skin shattering to pieces.
Love Triangle: Barnabas is in love with Maggie/Victoria, but also has a sizzling relationship with Angelique, who is still in love with him after 196 years (cue the massive amounts of Foe Yay and UST).
Mood Whiplash: After a very serious opening, the film morphs into a Black Comedy. However, the film does switch back to a darker tone at times.
Sometimes, it does this in a way that's very jarring. For example, when Baranabas finds a group of hippies, he grows to really enjoy being in their company, and opens up to them about his problems and feelings. The hippies, in response, are very supportive and nice to him, more than anyone else has been up until then, and Barnabas seems happier than he's ever been since he woke up in that century. Then he simply tells them that despite enjoying his time with them, he has to kill them all, and proceeds to do just that. It may be Played for Laughs, but it easily comes off as terrifying, even sad, that he would suddenly just do that to people that he had been bonding so well with.
No Smoking: Barnabas links up with a group of hippies who pass around a joint; he makes a point of not imbibing. (Interestingly, for some reason one of the hippies refuses to pass the joint to a girl sitting right next to him, as well.)
A deleted scene shows Vicki smoking in Carolyn's room and giving the 15-year-old girl the cigarette to smoke from. Although Carolyn actually doesn't do so, it's very likely the scene was cut due to the smoking.
Other than the above examples, very few adult characters are shown smoking, despite it being 1972. Angelique is a notable exception, though of course the Surgeon General's warning likely wouldn't apply to her anyway.
Not Good With Rejection: After Barnabas rejects her love, Angelique goes on to Murder the Hypotenuse (see above), curse Barnabas to be a vampire, lock him in a coffin for almost 200 years, and spend those consequent 200 years sabotaging his family for revenge.
However he can endure sunlight if sufficiently covered or keeps to the shadows.
Our Werewolves Are Different: Carolyn takes on a mostly human form with big hairy wolf legs, sharp teeth, golden eyes, and claws. Also, it seems she can transform at will, and is able to control herself rather than attacking anyone and everyone.
Or the final fight probably happened during a full moon.
When Roger tries to find Barnabas' hidden treasure, Barnabas catches him, reveals his strength, and gives him two options: become a decent father to David or leave. Roger chooses the latter.
The Patriarch: Barnabas feels honor-bound to protect his family and ensure their prosperity, and tries to assume this role. Of course, Elizabeth Collins Stoddard is filling this role as The Matriarch before Barnabas arrives.
Politically Correct History: Apparently, Angelique managed to successfully run a business for 200 years despite all legal limitations and social prejudice placed on woman entrepreneurs. Justified since it's implied she has the same power to charm and entrance people like Barnabas does. Also, it is never stated that she didn't use puppet "husbands" and "brothers".
Wheaties are awfully prominent on the Collins's breakfast table.
Protagonist-Centered Morality: Angelique is portrayed as evil for the way she terrorizes Barnabas and his family; but Barnabas' unethical actions (such as mind control and murder) tend to be glossed over, though Angelique does call him out on it.
Angelique about Julia's murder: Aren't we being a tad hypocritical? Lying and stealing blood are things that come very naturally to you.
Also may have something to do with the fact that Barnabas' evil actions only happen because of Angelique. Had she not turned him into a vampire out of a truly amazing level of petty spite, he wouldn't be able to hypnotize anyone, and he wouldn't be forced to kill to survive.
Barnabas: Yes, I killed Dr Hoffman, and those workmen, as well as some very nice unshaven people. For every life I take, a part of my soul dies! But I kill, only because I am COMPELLED to..
Psychotic Smirk: Angelique can be seen to be wearing one as she excuses herself to march into Collinwood Manor and face off against Barnabas in what would be the Final Battle.
Remake Cameo: Jonathan Frid, Lara Parker, David Selby and Kathryn Leigh Scott, who played Barnabas Collins, Angelique, Quentin Collins and Josette DuPres in the original Dark Shadows, appear in the ball at Collinwood Manor (they are the group of people Barnabas greets as they arrive for "the happening"). This was the last role for Jonathan Frid, who died less than a month before the film opened (too late for the film to include a memoriam caption for him).
The Renfield: Willie the butler becomes this after Barnabas hypnotizes him.
The Reveal: The climatic fight reveals that Carolyn is a werewolf.
Revenge by Proxy: Angelique has spent the last two hundred years ruining the Collins family as revenge against Barnabas for spurning her. When he escapes his coffin, she steps up her efforts.
Scenery Porn: Copious beautiful shots of woods, lakes, and cliffs. Also the interior of the mansion.
Sequel Hook: In the final scene of the film, Dr Hoffman is shown underwater opening her eyes, implying she was successfully turned into a vampire and thus will probably be back to give Barnabas grief. For fun, this scene recalls a shot of the drowned Shelley Winters, in 1955's Night of the Hunter.
Torches and Pitchforks: Angelique does this to Barnabas, making the town population descend upon him. Twice. He makes threats of doing the same thing to her, and have them Burn the Witch!. However, it is unlikely that they would have listened to him.
Town with a Dark Secret: Collinsport. The curse surrounding the Collins family is, however, unknown to the townsfolk.
Vampire Vannabe: Dr. Hoffman is using Barnabas' blood to turn herself into a vampire in order to stop her aging. It works.
Vampires Are Rich: In his life, Barnabas was the heir of an affluent colonial family. Over time, the family fortune dwindled, but fortunately Barnabas' father left behind some treasure in a secret room.
Vampires Are Sex Gods: Barnabas used to be quite handsome and knew his way with the ladies. His undead appearance may be freaky and creepy, but he still has romantic encounters of varying depth with three female characters.
Villain with Good Publicity: Angelique, to the point that she would have been a Hero Antagonist if it wasn't for two little details: That she is totally unapologetic about having turned Barnabas into the bloodthirsty monster he is, and that she in various ways goes out of her way to establish herself to the audience as being truly evil.
Visual Pun: Angelique is a walking one, especially around the point of the Final Battle. She's a hollow shell. Her beautiful veneer cracks and shows the real her. She tries to give Barnabas her heart, but when he turns it down because he doesn't feel the same, it breaks.
We Can Rule Together: Angelique tells Barnabas several times she likes the idea of the two of them ruling over Collinsport together as two super-powered immortals, but he refuses.
Angelique: I'm going to offer you a business proposal, Barnabas. My final offer; either you agree to rule this little pond of mine side by side, partners and lovers...Or I put you back in the box.
Barnabas: I have already prepared my counter-proposal. It reads thusly: You may strategically place your wonderful lips upon my posterior and kiss it repeatedly!
Weakened by the Light: Barnabas actually catches fire when exposed to the sunlight for a relatively short period of time.
What the Hell, Hero?: Barnabas frightens off David's father, adding to the poor kid's woes. His mother already dead, now his father abandoning him as well. There's no sign that Roger explains his actions either.
Yandere: Angelique. Good lord, Angelique. She sets out to ruin an entire family simply because her beloved spurns her advances.
Arguably, it's not just that. She mentions, during her visit to Collinwood, how she and Barnabas had lots of "fun". It's fairly safe to assume they at least had sex before he none too gently let her down and moved on to another woman, of higher class (which would no doubt anger her Inferiority Superiority Complex). She went very overboard, but it's not like she didn't have some provocation.
You Shall Not Pass: Willie tries pulling this on Angelique during the climax. However, she simply knocks him aside without even breaking her stride.
Carolyn (in werewolf form) tries this late in the fight, with a bit more success before finally being beaten.