system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What is it that makes some TV shows look cheap?

I don't know how to describe it exactly, but some shows just look... cheaper.  I'm hoping whoever reads this knows what i mean... older Canadian shows have that look, some BBC shows have that look, older Korean Dramas (and some recent ones) have the look...I thought I had figured it out -- it was something to do with static camera work, but I was watching something recently that had that same 'cheap' look and the camera work was the same as any other show. So now I'm not sure, and I'm just curious about what it could be...
gpt
One significant thing is lighting. People underestimate both in photography and in video how bid a difference professional lightimg makes, but it is also something that is wasy to not invest in or not do right and think the audience won't notice as much.

One other really interesting thing is frame rate, when shows suddenly look "cheaper" on your new hd  tv. For years things like soap operas among other shows used a faster frame rate from movies (i am not sure exactly why). This trained our brain to expect a certain type of show when experiencing a faster frame rate (something most of our conscious minds can't detect). In many modern HD tvs, the tv adds extra "in between" frames to get everything up to a faster rate, but the side effect for many of us is that these tv shows and movies now look cheap, until we have finally retrained our brains.