Well… here you go.
The last two episodes are both labelled as episode 24
TV Shows/Lost/Season 01/Lost - S01E24 - Exodus (2).mkv
TV Shows/Lost/Season 01/Lost - S01E24 - Exodus (3).mkv
^^^
Change the Exodus (3) file to go as E25 instead.
Afterwards you probably need to perform a Plex Dance to make Plex forget it had that file already catalogued as s01e24.
