Board Thread:Character Discussion/@comment-24018089-20170519182024/@comment-25640758-20170625032951

The Gray Door in the second hat could be a redesigned version of the door to the Land Without Colour.

Also, I'm not sure how the Pink Brick Door could be connected to Harry Potter. Because 1. J.K. Rowling hasn't given Disney the rights to Harry Potter and 2. pink bricks have nothing to do with Harry Potter (unless you are referring to the entrance to Diagon Alley, but the bricks there were coloured regularly).