Hiding Secrets in the Open

The sequence between Sifu Joshua and John reveals some secrets hidden in the open. Do you know what these secrets are? Some close secrets are also explained by Grandmaster Wong. They are found in the sequence between Sifu Mark Hartnett and Sifu Robin, and the demonstration by Grandmaster Wong and Sifu Tim. Please remember that these are close secrets, i.e. secrets taught behind close doors, and should not be revealed to outsiders.