I'm currently hitting http://api.tvmaze.com/shows?page=X for as many pages as possible from 0 until failure. This returns 44,240 TV shows with the highest ID of 46200. However there are TV shows in the api with higher IDs, the highest being 46210. So that is at least 10 shows that the /shows?page=X endpoint is missing.
Also, for newly added TV shows, am I right in assuming that hitting the /updates/shows is the best endpoint to hit, to find newly added IDs?