If a fictional-but-popular TV show treats some kinds of evidence as more reliable than they really are, juries may be primed to believe in the kind of thing the TV show presents as legitimate.

https://en.wikipedia.org/wiki/CSI_effect

Sure but lawyers would know that and ensure evidence doesn't get presented that way right? There are also a lot of other biases that lawyers have to navigate through.

Humans are flawed but that doesn't mean everyone in the jury thinks TV is real.