Patton's wedding band is probably his ring for his new marriage (to an actress). He married her a little over a year after Michelle died. Which was pretty quick, honestly.
I find it terribly distracting how much Michelle looks like Diane Schuler, featured in There's Something Wrong with Aunt Diane. And all the talk about how they were perfectionists, etc. I feel terrible, but Michelle reminds me of her, so much. Weirdly, Liz Garbus, who is the director of this show, was also the director of There's Something Wrong with Aunt Diane.
I'm dubious that her drug use was entirely the result of the disturbing things she was researching. I think it was probably an issue before that.