At the beginning of the film, not long after the seance. Donna mentions in conversation with her friends that Yorga was her mother's boyfriend. Naturally it won't take much for the audience to put two and two together, especially when Donna reveals her mother died not long after Yorga and she were dating. And that Yorga was insistent on her body not being cremated as her mother had originally intended. From the way she talks about it, it's obvious he used his powers to "convince" her of this option so he could easily retrieve the body after she was buried. What makes it scary is the fact no one could actually tell what really killed her unless Yorga managed to hypnotize the couriers as well.
Yorga's first attack on Erica and Paul. Dated or not, seeing Yorga's glowing face standing out in the darkness like that is spine-chilling.
Yorga may seem like a charming gentleman...at least until he reveals his Game Face. The charm's just a façade that only hides the real monster within. And at the very end, despite being killed (even in the second movie), he manages to troll the protagonists before and after death, and technically win, as anyone afflicted with his vampirism is permanently stuck with it — and always evil.
Erica going through her vampire changes after she's bitten the first time. Before she was pretty silly yet fun loving. But after she becomes despondent and listless, then the bloodlust kicks in and she can't even be aware of her surroundings. Turning her apartment into a mess in pursuit of her kitten. By the time Paul and Micheal reach her. She's succeeded in catching it and eating chucks of it out of it. When she's discovered, she screams like a banshee. But then her attitude does a 180 and she talks in a seductive voice beckoning Paul to come to her...before coming to her senses. She promptly breaks down in his arms, crying. What's worse? This is the last bit of humanity we see from her, Yorga claims her shortly after and completely turns her into a vampire.
Before Yorga even does, after Erica breaks down, the men realize she suddenly lost blood out of the blue. They try for a transfusion to which during so Erica babbles inconsistently, begging Paul to "Not to hate her", "Not let it happen" and "To forgive her". But when asked what she's talking about, Erica can't remember. It's like the human part of her knows she's being corrupted but can't fight against it and is preventing her from telling the men. She ends it by begging the three to "Let her die!". Sadly however, she gets her wish...when Yorga finishes draining her and robbing her of her morality, leaving her as an undead under his command.
How Paul is easily dispatched. He doesn't even stand a chance against Yorga, who, not only was expecting him, but easily kills him by simply choking him. Then letting his servant, Brudah, deliver the final blow via breaking his back.
The worst thing is he was invading Yorga's home to save Erica, but his cause was already lost as she had been completely drained before he discovered she was gone. Even if he reached her, her undead form probably would've killed him herself.
Donna's rape by Brudah, Yorga's barbarous manservant. It isn't shown, but that hideous scarred face lowering to the camera tells enough.
While it wasn't shown, Hayes's girlfriend describes how a baby was found in the swamps drained of it's blood with it's neck chewed up. There was meant to be a scene of Donna's mother feeding on said baby (holding it from a leg and head, as if it was a chicken wing) and the red-headed bride trying to get her share, but was not used most likely because the filmmakers found it too disturbing. Heck the cat scene alone got them into a bit of trouble with the MPAA (this was the 70's at a time when scene like that were not looked on favorably), one could only imagine they would have a heart attack if that scene was added.
Hayes's death: starting off with him being shown the brides' quarters where he finds Erica among them but far too late to be of any help. Yorga starts mocking him and laughing in his face. Even though Hayes came prepared, he's at a loss what to do as he hold Yorga a bay with a cross and stake. However he's so fixated on Yorga, that he fails to notice the brides awaken and close in on him from behind. They quickly gang up on him, force him to the floor and feed on him, where we hear Hayes' anguished yells amid their slurping sounds. Yorga looking on with a total lack of empathy before hiding upstairs really completes the dark mood of the scene.
Paul's mutilated body in the crypts of the manor. More then likely Yorga has also fed him to the brides. And since Erica was among then at that point, she proabaly ate her boyfriend but didn't care in the slightest about it due to the monster she's now become.
Speaking of Erica, there's a scene shortly after where Micheal comes across Hayes's dying body. He tells her where Donna is only for Erica and another vampire bride to come rushing into room, apparently still hungry even after feeding on Hayes (they could've been the one who even set the trap). Their growling and hissing really emphasis how inhuman they've become. Michael manages to hold his ground and scare off the unnamed bride. But Erica just stands there, as if a small bit of her old self is still in there somewhere and wants Micheal to kill the creature she's now become. He hesitates and tried to bring himself to do it but ultimately can't and runs off. Whatever what was pausing her now gone reverting her back to a bloodthristy being.
Yorga's death is pretty chilling too, especially considering it was caused by his own hand. Gasping in shock as the stake punctures his midsection then letting out a death wail followed by quick cuts of the camera before he finally succumbs. What's more when Micheal and Donna see him again, he's turned completely into sand with empty eye holes and the impression of teeth where his face once was. It's a very chilling image.
If you see the whole thing from Micheal's perspective it's pretty nightmarish, three of his friends go missing. He invades a compound he knows nothing about to fight a creature he only only aware of in movies. Then once in the place, he finds Paul's body mutilated, tries to reach Hayes only to get to him too late and can do nothing but watch him die as he uses his last breath to tell him where Donna is. Shortly after he's force to confront Erica, no longer his bubbly friend he once knew, but now a vampire ready to kill him. She does give him the chance to stake her and he knows he should as she nothing more then a walking corpse. But he can't do it and leaves. And then of course he finally reaches Donna, Yorga, and Donna's mother. It's pretty clear he's in over his head and not really sure what to do other then try to call Donna over him. Luckily Yorga's own actions do him in, but even with his death it's not over yet.
The final bit of the movie, starting with Erica and the unnamed bride coming after Micheal and Donna. Even with Yorga dead, the vampirism is permanent so there's no saving Erica. Unlike last time, she doesn't pause either, meaning she's fully embraced her new evil lifestyle. Micheal and Donna run down the opposite staircase with the brides doubling back to meet them in the middle. Micheal manages to hold them back with a cross and the two women are forced back. However Erica gives a odd glance at Donna, The two are soon forced into a cellar where Micheal locks the door, dropping the cross in the process. He leans against the wall, panting, thinking is over. Just as he catches his breath and turns to Donna she rushes at him, fangs bared and hissing loudly. But no thats not the kicker, we get some final dialogue from the narrator who laughs at the notion of vampires being "superstition" before cutting to a still shot of a dead Micheal, bite marks all over his face.
The Return of Count Yorga
The beginning of the movie where, after the Santa Anna Winds are explained. We go to one of the orphans, Tommy, playing in the local cemetery, he barely makes out a voice in the wind saying "Rise, It is time." But pays it no mind and continues on, as he passed by a few graves, hands suddenly break through the ground. Tommy remains unaware as he stops to rest while bodies of undead women pull themselves from their graves behind him. And unlike like the last movie where there was only three vampire brides, there's a whole group of them here implying that Yorga's been busy in the area. Tommy finally realizes he's not alone and sees them, making a run for it as the women stalk him. Just when it seems he'll outrun them, he runs right into Yorga in vamp mode who looks ready to feed on him and promptly screams before the movie cuts to the orphanage fund raiser.
Yorga encountering and biting Mitzi before he reaches the fund raiser party. It isn't till he interacts with everyone then makes to leave that she finally stumbles into the party and everyone rushes to treat her.
Some of the appearances of the brides who have discolored or disfigured skin. Apparently before the vampirism took hold. Their bodies decay normally while underground.
The whole attack on Cynthia's family, the brides just break in and, without any hint of emotion, overrun the family and kill them. Poor Ellen gets the worst of this as every exit she runs to is a vampire bride waiting before one manages to wrestle her to the ground and feed on her.