[[WMG: The events of the musical were the initial sequences in a ButterflyEffect that eventually brought the Roman Empire to its ruin.]]

That girl and that boy - the ones with the matching necklaces - will be the ancestors of Pope Leo.
*"Nothing for kings, nothing for crowns..." That isn't just a description, it's a prophecy!
*And this musical ends with fun and silliness triumphant. This attitude became infectious until everyone became addicted to the circus.

That really ''was'' the Third Doctor in the film; he was just passing through, and decided to meddle a little bit along the way. Pseudolus becomes a new Companion shortly after the film ends.
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