That’s pretty much the secret to TV metadata. Occasionally they will throw a curve ball and goof something at TVDB but their pretty good.
No other suggestions but you may want to scan the users guides since many have been updated recently on many of the features.
If you run into anymore issues feel free to ask in the forum and we’ll see what we can do.
Keep an eye on the upcoming features thread since it’s updated often.
It looks like the first phase of searching by actor and associated crew is being worked on for the upcoming release so it should be soon. I’d guess it will be the basics first and then Firecore will expand on the concept so stay tuned.