It can be great to pull a backup card when you feel that you need more clarity or information on the cards pulled for The Basic Row.
When you feel you need more info, it is most popular to pull an extra Tool. You are free to pull an extra Character or Place instead, if you feel those categories will add more information to the picture.
Pro Tip: Have fun with improvising, and riff on what cards you get. For example, if you pull the Airplane card, perhaps pull two more Places to see where you are coming from and where you are going. Or if you pull the Jail Cell card, pull an extra Character to see who will help get you out of jail.
This practice can explode the game, arming you with quite a powerful intuition!