Yes, the series is obviously made for Italian TV, and "standard Italian" is really the only dialect understood all over the country. If you had, say, a Piedmontese and a Sicilian, who spoke only their native dialects, trying to hold a conversation, it would be fun to watch. A truly authentic Sicilian language version would have tiny ratings methinks. I know there have been grumbles that the actor playing Montalbano isn't Sicilian.
(One of the minor joys of a recent trip to Italy was watching an episode of NCIS dubbed into Italian. Quite credibly, too.)
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