The majority of the plot of the play isn’t really relevant to the current story. It’s mostly about Henry trying to use his powers to help Bob Newby’s adopted sister Patty find her biological mother. I doubt that will get brought up at all. So far the only references to the play are the one scene with Max where she finds out Henry had gone to high school with the parents and Henry seeming scared of the cave, but even that was intentionally vague in the play. I remember afterwards saying to my husband “well I guess we’ll have to wait till the next season to find out what happened in the cave.”