Welcome to the forum and congrats on your new beardie. 8)
I hadn't heard that it is harmful for beardies to watch TV. Our do too, from time to time, but their vivs aren's directly across from it. They seem to like the bright colors and listening to different sounds.
When you said that Jack stands on his back legs and jumps.......does he do this as he scratches the glass, if so, this is called "glass dancing." They all seem to do it from time to time and could mean that they want to get out and run around, have to take a poo, but don't want to do it in their viv, or perhaps he sees his reflection & is reacting to it. If it is the latter, you may want to cover the sides of the viv, if it seems like he is getting stressed out.
If you want to read up on beardie care, there is a wonderful
caresheet at the top of this forum that has all the necessary info and then some.........
The people in this forum are great and have lots of knowledge, so if any questions, just ask away. Good luck with Jack.