"Persona" effectively marked the "beginning of the end" for many original series elements:
: Bizarro continues to pose as Clark, living a blissful life with Lana Lang while the real Clark is frozen in the Fortress of Solitude. [S7E10] Persona
: Lana later expresses that she felt "happier" with Bizarro because he was honest with her, highlighting the cracks in her relationship with the real Clark. "Persona" effectively marked the "beginning of the end"
The Talon Mix: A Smallville Recap Podcast - Spotify for Creators : The episode deepens the mystery of Lionel’s
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: Many viewers argue that Lana should have known it wasn't Clark, especially given "Bizarro's" sudden willingness to be intimate and open.
: The episode deepens the mystery of Lionel’s redemption as he attempts to protect Clark's secret.