What exactly constitutes something looking like a fan-film?
Good question… it’s very subjective, I guess. For Star Wars generally I would say:
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Outdoor locations that are way too familiar/Earth-like (like a typical Northeastern forest or Southwestern desert - a very US-centric sentiment for sure) especially with bright lighting
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Live action footage that doesn’t have the same texture as Hollywood 35 mm film (or modern digital filters that emulate this appearance), but instead looks more like digital video, especially with overly bright lighting.
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Amateurish cinematography (repetitive or clumsy framing, shot angles, etc.)
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Bad CGI
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Fantastical looking characters in mundane locations (i.e. Vader in an outdoor quarry at night)
A lot of this is subjective. I mean you could argue Endor looks like a fan-film location. But it’s usually multiple elements that combine to make it look really fan-filmy.