This is Senthil Prabu...
Thanks Alan for the nice video,
Following tips may help to understand the tool better...
Reason for the Crossover mesh:
The particular cage face is a non-quad cage face, so the OpenSubdiv Library use to generate subdivision mesh like this only. At present the workaround is to convert that face into multiple faces.
From the Alan's video:
-> "Face hole" is used to toggle on/off its dependent subdivision mesh. In the video, instead of using "Face hole", Use Transform mode, select the face and hit "Delete" button, the particular cage face will be
deleted. Then you can use the Bridge mode to close the face with multiple faces as you did for bottom face.
-> To Crease everything:
Being inside the "Edit Subdivision" tool with a Subdivision object is selected. User can right click to get the following context menus to crease/uncrease everything.
Crease All Edges
Smooth All Edges
Crease All Vertices
Smooth All Vertices.