>>102311808I think its a combination of writing revisions, storyboard changes, and deadline to finish work to move onto S4. A lot of things that were on writing board for S3 either didn't make the final cut, or weren't further explored. The asterisks on certain episodes can indicate anything, but they were important enough get them. Future revising maybe? S3 was a hodgepodge ideas that never really seemed to be cohesive. S2 managed to tie the first love triangle, ludo's rise to power, and the return of Toffee all into the finale.
With the exception of Battle for Mewni, S3 post-BfM for the most part was sorta directionless with characters interacting and things happening to keep the plot moving along until something drastic changes the status quo.
Just look at the writing board and all the ideas they had but left on the cutting room floor. Bounty Hunter? Lekmet Replacement? Diplomats Banquet? Rich Pigeon Monster Club?
All of these ideas would have been interesting and would've actually made sense, especially the one with Rich Pigeon. He had a club for monsters? No wonder he picked the monster temple then, oh wait, it was never explained why he chose that as a venue. Fuck S3.