These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Anvilicious: Nearly every single slave owner and Confederate is portrayed as a vampire sell-out. Exceptions include Robert E. Lee, P.G.T. Beauregard who is seen in his historical role at the first Battle of Bull Run with no indication that this prominent member of the Confederacy is anything other than human and, pro-slavery Democratic candidate Stephen Douglas who does an abrupt Heel-Face Turn once he realizes just what is going on.
Captain Obvious Reveal: Henry is a vampire! ...but the fact that he has large amounts of sunscreen in his house, wears sunglasses all the time outside, can appear places unexpectedly and is privy to inside information about vampires meant that most audience members were well on the that track already by the reveal.
Complete Monster: Adam, the vampirefrom whom all other vampires came and the ruler of all vampires in America, is a 5,000 year old monster who makes his home in the American South. Having created a system where the vampires stay secret while draining the innocent, Adam nourishes his "family" by using slaves sent to the plantation to be drained and torn apart for their blood. When he hears of young Abraham Lincoln's abilities, Adam sacrifices multiple vampires to test Lincoln's abilities and makes Lincoln an offer to become Adam's personal hunter, starting with Henry Sturges, Lincoln's Mentor, who Adam turned into a vampire after murdering his fiancee. Adam later commits his forces to the Civil War, slaughtering Union soldiers en masse. To punish Lincoln for his resistance, Adam sends his sister and enforcer Vadoma to murder Lincoln's youngest child.
Ho Yay: There's a fair a bit between Abe and Henry. Especially the scene following Ann's death, and when the book notes at Abe's funeral that "Though [Henry's] eyes were incapable of tears, he felt the loss of Abraham Lincoln more deeply than any living person in Springfield that day." Even though Abe's son was also there.
Indecisive Parody: The stark contrast between the film's dead serious dramatic scenes and over the top fight scenes makes it a bit too schizophrenic to take at face value. It works much better as a parody of action movies, but that does not seem to have been the intent of the film's creators.