system
Given the following post, respond as if you're commenting on Reddit:
human
[The Flintstones] The people don't have electricity, so they have to use animals instead of appliances. How do they have tvs?
gpt
In the intro, the Flintstone family goes to a drive-in theater. The fact that their society has developed this technology tells us three things about them: 1. They've discovered lenses, 2. They've invented motion pictures, and 3. They've developed ways to manipulate simple candle light in such a way that it's strong and focused enough to project said motion pictures.  
As you said they haven't discovered electricity yet, which means they can't have developed CRT technology yet, which leads me to conclude that their TVs are probably some sort of miniaturized projection setup.