I would like to be able to mark/code/highlight in some way certain of my Observations so I can pull them up easily in the future. For instance: I have some Observations that are special (at least to me). Maybe they were fascinating species I want to learn more about, or are “first in state” or “first in region.” I would like to be able to pull them up in the future. I considered using Tags such as “follow up” or “first in state” or whatever, but that seems very clunky. Is it already possible to do this and I just don’t know it? 
1 option is to favorite them. Another is to create a traditional project and add them one by one.
it sounds like you could jot some notes in a journal entry, including lists of observations. you don’t have to publish the entry, if you don’t want others to see it.
You can also use tags
If you are on Chrome bookmark to a folder. Then you can name, sort, and control to suit.
(I have dozens of bookmarks for iNat)
iNatting all the way back to prehistoric rock art!
These are all good suggestions. I think I’ll try to come up with a system of Fave and Tags that I can keep organized and use consistently. Thanks to all! Really appreciate it.