The following are a few issues I am finding with the interface and Sporepedia (in-game) side of the game. Some of these I'd consider to be bugs and some just need a little improvement. None of them affect gameplay in any way.
1. Creations from the Creature Creator are not appearing in My Creations.
This seems to be a common problem without a reliable fix. At least not one I'm willing to try based on what I've read so far. Just included here for completion.
2. Online search does not find all my creations.
If I search using the in-game search for my user name, only one of my creations created and shared within Spore is found. All of the creatures from the Creature Creator do appear. This is also the case for the search on the web site. Searching for the name of a missing creation also returns no results.
As a side-effect of this, I am unable to create sporecasts of my own creations from within the game since they can only be added (as far as I can tell) from online sources, not My Creations or Everything. Sporecasts can (again) be created from the web site.
3. Online search results only display on a single row.
There is room for 3 rows of search results, yet only one row is displayed. Three times as many search results could be seen per page if these rows were used.
4. Find Sporecast does not find all my sporecasts.
As for the creation search, searching for my user name only results in one of my sporecasts appearing. Again, the web site search also has the same problem and searching for the name returns nothing.
5. Find Sporecast is slow.
The Find Sporecast funcion is very slow loading the icons representing creations. With only three displayed per page, it's a very slow process finding sporecasts. Additionally, there is no way to enlarge or properly preview items in the sporecast, so the decision to subscribe or not has to be based on a few very small images.
6. Creations added to own sporecasts do not appear in the sporecast list.
I've added creations to my sporecasts through the web site, but none of the new additions are appearing in the sporecast entry in Sporecasts in-game. Only those items added when they were first created appear. When searching for the sporecast in the Find Sporecast search, the newly-added items do display in the preview (for those sporecasts that can be found - see point 4).
7. Recent Sporecasts in user profile.
When viewing my own profile, the Recent Sporecasts section seems to just show random sporecasts. I'm not subscribed to any of those it lists.