Windows that don't roll all the way down. Look, if your child is trying to leap out a window, they're still going to manage with that stupid chunk that can't be rolled down, and it's probably for the best.

Run flat tires on sports cars. They add so much damn unsprung weight, if you can afford the car you can afford AAA.

Unnecessary engine bay trim. I understand an engine cover in spite of never using them, but you don't need so much tacky plastic trim that there appears to be second hood under the actual hood.