Q: Is it called "no castle" because the castle is actually John Travolta in disguise? Or was he just in fhe castle and the title is meant to trick the viewer?
A: the title was based on the music. the music existed before the video, and the title for that music is 'no castle'.  That's because the music seems to have a feeling of "no", fortified into an entire castle. Imagine an entire castle of no. Then, later, a video was made, to reflect the music. I should clarify, that the music also seems to have a twist ending, which arguably may have turned it into a yes castle, but i tried to leave that open for the listener to decide