Sometimes when I've found new communities on non local instances I'm unable to subscribe directly and I get a screen where it asks me what instance I'm subscribing from and when I click the only suggestion "lemmy.world" it doesn't recognize it as valid. I know you can subscribe to these communities in distant instances by using the local search bar with an exclamation point in front of it but it's a convoluted process and could be streamlined.
Another thing I just ran into, if I'm linked to the on-instance version of a thread on an instance other than my home, it says I need to log in or register to comment. How do I switch to the version of that same post as seen from my home instance? I wouldn't need to register a separate account because I see a lot of off-instance posts on my home feed. Perplexing.