The trim piece that's at the very bottom of the rear passenger side door opening came loose due to broken pins. I have no idea what it's called, so if anyone with better knowledge of Toyota parts catalog could look up the name of it and a part number (2010 Prius), I will be eternally grateful. Again, that's the piece that you pry to get access to various wires (or to route your own). Mine was basically destroyed by thousands of drunks (I'm an Uber driver) tripping over it.
The part you're looking for, I think, is called "rear sill trim", and available online for around $60 per side. Part numbers vary by color: -LH light gray: 67918-47041-G0/RH light gray: 67917-47041-G0 -LH bisque: 67918-47041-E0/RH bisque: 67917-47041-E0 -LH gray: 67918-47041-B0/RH gray: 67917-47041-B0
