A typo in the page of 'Camera Calibration and 3D Reconstruction'

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The page, 'Camera Calibration and 3D Reconstruction' is made excellent and important to beginners for understanding of CV: link

But, there are two things found for improvement:

1. There is no description for (x, y, z): I think it is the coordinates of a point in camera frame Xc-Yc-Zc.
2. In the first figure, instead of P=(X, Y, Z), p=(x, y, z) would be better for understanding because only the camera frame Xc-Yc-Zc is drawn in the figure though P and p indicate the same point in different frame.