Television, before it was fractured into a million channels, was a great language leveler. In elementary school, I noticed that my classmates who did not have TVs couldn't shake their hillbilly accent, while those who watched television learned to code switch at an early age, and speak like Hollywood actors when they wanted. Today, we have TV shows from around the world, so that children pick up words and accents from shows like Bluey and Peppa Pig. Dora the Explorer introduced millions of American children to Spanish. And TV is a boost to anyone learning a second language. Dr. Erica Brozovsky (previously at Neatorama) explains what is happening when children listen to the language of television.
But more TV doesn't necessarily mean better language learning in children. Too much television actually hinders their learning, when it cuts into the time they speak with the adults around them. At the end, we find that Dr. Brozovsky is just as cute without the red lipstick.