Fan Nickname: Dr. Orpheus: The Movie from those who noticed a comparison between Dracula and Mavis to Dr. Orpheus and his daughter Triana from The Venture Bros.. Both are single dads with a Large Ham nature, Orpheus has been mistaken for Dracula, both daughters are a Perky Goth with short hair, a short skirt, and striped stockings, and both girls have an Adorkable love interest.
In the first trailer, when Jonathan first enters the hotel, he loudly says "Hello?", a shocked Dracula says "A human!" and Jonathan says "What is this place?" In the movie the animation is the same, but the characters don't say anything until Dracula traps Jonathan in the revolving door.
Also, in the scene where Dracula and Jonathan are in the tunnel network and have the accidental pervert moment with the skeleton in the shower, Jonathan is dressed like his normal human self. The movie version of the scene has him wearing his "Johnnystein" monster disguise.
The Bigfoot who causes the clogged toilet problem had white fur with blue hands and feet in all the trailers. He's brown in the final version, probably because so many people said he looked more like the Yeti.
The silhouetted montage of all the monsters of the world beginning their travels to the hotel from their respective hideouts is cut from the final film.
One trailer showed the scene where one of the suit of armor gets kicked between the legs, making it look like Jonathan did it when it actually was Quasimodo.
The scene with Dracula going down the hall with the shrunken heads has some difference to the voices between the trailer and the movie.
At no point does Dracula try to convince Johnny that this is just a normal hotel, unlike in the trailer.
Money, Dear Boy: Genndy Tartakovsky has made no secret that the only reason he took the job initially was because he needed work after Sym-Bionic Titan was canceled, although he has also said he's happy with the movie and was excited to do the sequel.
Saved from Development Hell: The film was first pitched in 2002, started development in 2006, and went through 5 other directors before Genndy was brought, by which point so much had already been rendered that it was, as he put it, "like coming onto a live action set." He was given the task of rewriting, redesigning the characters, and re-supervising the animation all in under a year. The DVD commentary mostly consists of Genndy explaining all the creative hurdles they had to do when recycling pre-existing set pieces for new scenes, since they had no time to create new models. When he was made director, the film finally started to come together and was given a release date in 2012.
What Could Have Been: Jonathan was intended at one point to be the last descendant of Abraham Van Helsing, which would have created a even bigger conflict between him and Dracula. It is not known when this plot point was dropped.