@andcbii said:

If I'm looking at the info for a show on plex and it says the TMDB id is <Guid id="tmdb://974342"/> How can I verify on TMDB that the ID is correct.

This Id value can be the Id of a movie, but not the Id of a show. There are currently no Id with a big value like that for the shows.

If i go here:

https://developer.themoviedb.org/reference/tv-season-details or https://developer.themoviedb.org/reference/tv-episode-details

I can enter the series, season, episode info and get the ID, but is there a way to use the ID to get the show, season, episode info?

The links you indicate, as well as https://developer.themoviedb.org/reference/tv-series-details are the documentation page for the API methods to get all the main details for a show.

By calling the methods described and giving them the Id (as well as the season and/or episode number), you will get all the infos.

For a movie, you will have to call the method described on that page : https://developer.themoviedb.org/reference/movie-details

Just making sure I understand. You cannot lookup an episode by ID. What i posted is an episode ID plex is using to match.

Only movies and series (as well as people, companies, networks, keywords) have usable Id, not the episodes.