"...when I tell people I had seen the show after I saw it..."
Well, yes and no, Dan. You could have been ever more correct if you had phrased your query like this:
"...when I told people I had seen the show...", thus making the verbs agree in tense. You could also have said:
"...when I tell people I have seen the show...", once again making the verb tenses agree.
So, anyway, didja see the show, or are you just telling people that you saw it? I didn't see it.