Scott215

Question: During the party near the ending, why did the guests panic when they saw Jonathan's true identity?

Answer: Throughout the movie, Dracula has been drilling into his guests the history of humans' mistreatment of monsters, hence the building of the hotel, which was to be a monster's refuge from the human world. Most of the monsters likely had never interacted with humans, so that coupled with the stories from the past caused the monsters to freak when they saw Jonathan's true identity as a human.

Scott215

But they had been hanging out in the hotel for long and johnny wasn't a bad person so the shock is unjustified.

The fact that he'd been hiding his identity the whole time would be enough for anyone to be concerned, especially when the reality was that he was a human, who they all have been in fear of for centuries.

Answer: Part of the shock would be him lying all this time, or the possibility of him being a fake Johnny.