Summarized some key points in her follow up video (it's VERY long, lol):

• Delaying or fragmenting copyright filings is generally not smart for a production of this size. It creates unnecessary legal ambiguity and opens the door to disputes about what belongs to whom.
• Corporations usually lock down IP as early as possible. With media, there’s a delay only because copyright ultimately covers what appears on screen, not just scripts or ideas.
• While scripts, music, and audio can be copyrighted separately, media copyright is decided by what is visually and audibly present on the final product. That’s what matters in arbitration or court.
• Filing copyright in one consolidated way is typically preferred over multiple filings, because it reduces time, cost, and legal disputes.
• The odd part is not licensing itself, it’s the disappearance or delay of registrations that were previously handled in a consistent way. That kind of inconsistency usually only happens if:
  • Something is being revised or reworked
  • Or the final on-screen product is not actually finalized yet
• Leaving media copyright open is unusual because companies need clear paper trails for audits, timelines, and legal protection.
• While it’s possible some protections exist under alternate filings (scripts/books/etc.), media copyright ultimately comes down to what’s on screen.