If you show Germaine an item/hint while Temmie is in the room, Temmie reacts to it instead? Though this only matters the first time you knock on the garden shed. If you show Suzie incorrect item/hints, you get sent back outside her room. If you give Mithra the clock, she fixes it but then there's a blank space where it used to be in the Hints. I'm guessing this makes it impossible to progress further? I've gotten the purple mushroom but don't know what to do after showing it to Germaine. No one else but Temmie (who reacts the same to all fungus items) responds to it so it's another dead end.
Viewing post in The Midnight Mansion Murther comments
I'm aware of some of these bugs, though I thought I corrected the one with the alarm clock so thank you for mentioning it, will look into it.
The ending is not in as of now, so you found most of what was to be found anyway. I will put a completed version with all these bugs fixed when the jam is over if you want to try it then!