The chessboard that Miranda uses is set up 90 degrees rotated from its proper position. Facing the board, each player should have a white square on the far right of their back rank. This board is positioned so that the black squares are on that side.
The metal-thread piping on the outfits of Antonio and several others are actually zippers. This is clear in the close-ups for the spell circle scene where a zipper on his sleeve is open and the slider is visible as Prospera talks to him. The zipper sliders on the top of the outfit that Prospera wears after this scene are still attached (they look like points, or ends of laces).