I don’t see the problem - IANATaxAccountant, but…
If you want to research a specific show, or get ideas for it, you spend money to go on a trip to see how the hotel works, what the countryside there is like, or visit art galleries, go to the top of the local tower, etc.
Then you write and produce that show, or sell the idea to someone who does. The money for the show involving that locale can be used (plausibly) to offset some or all the costs of that “research”. You might even get away with “I visited 3 different locales and picked C”. (Show detailed notes of all locales as proof) Otherwise, hope you had fun on your vacation…
Where the OP might have a plausible case is if the show is in ongoing production - “We made season one and are getting ready for season two, possibly three”. Then it could be argued the research is part of an ongoing enterprise, if there’s a decent amount of relevance.
But once there is no definite process underway for future episodes that can be shown to the tax people, (i.e. show was cancelled, or no concrete plans for next season) then any research becomes a separate project which requires the costs to be written off against income from that project. IIRC from news stories, each movie is a separate “enterprise” with its own set of incomes and expenses, for example.
This is not different from anything else. The engineer who moonlights as a budding artist or antique car restorer cannot use his expenses as an “artist” or “restorer” to deduct from his engineer salary the cost of his art studio rental and equipment or fancy car hoist and spray paint booth. But he can deduct those from any income generated by the effort - provided, as LSLguy points out, he eventually makes a profit (2 out of 5 years). Otherwise, it’s a hobby not a business and you can’t deduct your big boy toys.
This is the point - as long as it can be shown the travels were relevant, that there were notes and details on what would fit into the show, and there is still a show in production… yes, why not? You’d have a hard time fitting in, say, travel to a place where foreigner hijinks are more frowned on (let’s say he goes on the Haj in Saudi Arabia) then I assume he’d really have to sell it to the taxman.