It must be the reflections from the table top that the camera was resting on, although I did scrutinize the pressure plate now that you mentioned it. The hot spots are on the neg itself. Thank you for the tips. All the other low light interior shots look OK.
Here's one of the inside shots that worked fine, along w/ a cloud shot. On the latter, I forgot to refocus the camera after shooting inside, and I couldn't see much in the ground glass because the sun was right behind me flaring the view, but I like it out of focus anyway.
This film is amazing. Thank you to member MrBrowning for gifting it to me. If it's exposed the right way, and it seems to be as picky about exposure as slide film, you can get deep blacks almost like plate photography. Yes, things block up in the shadows, but I like that part too. This was 13.5 minutes in TD-16. I followed the digital truth chart for D76 times, temps, and agitation scheme (the last one I blew rather badly), and adding a little time for the difference between D76 and TD-16.