Will Clay’s mental health continue to deteriorate?
In the final episode of season two, Clay tells Hannah Baker he loves her and bids her farewell. The physical manifestation of Hannah's spirit that's haunted him throughout the season then walks out the door and into the light.
Some have taken this as a sign that Clay has gotten past his anxiety. However, in a world where one out of five adult Americans suffer from a mental illness in a given year, issues such as depression, schizophrenia, and bipolar disorder are all topics that may feed an important discussion in season three.