Of course not having kids yet I'm not much to talk here, but what was wrong with looking out the window like I'm guessing most of us did growing up?
Some context for those of you without (small) children.
When we were kids safety requirements were much more relaxed. I remember as a child my parents had a full size conversion van. We were pretty much able to roam free and play with toys on the floor, roughhouse or various other things to pass the time. But now you stick a one year old in a car seat with a five point harness, tight enough they can barely move, barely able to see over the window sill if at all. Don't get me wrong, I think the safety standards are a good thing. However, you put a child in those conditions for long periods of time they get upset. Blue sky and books they aren't old enough to read yet can only entertain so long. And if they ain't happy, you ain't happy.
I agree that tv and DVDs aren't a good practice all the time. We have a half hour rule. If our trip is going to be half an hour or less, no TV. Even then we will wait to turn it on or still not use it unless we fell that the mood of the children warrant it or we want them to stay away until we get home so they don't ruin a full nap.
Edit: no I don't think we roamed free at a year old, but just giving an example for what I do remember.