Not as spectacularly wrong, but I've frequently seen Debbie booking flights to/from Houston Hobby instead of Houston George Bush. Obviously, the entire Gulf of Mexico isn't between them, but it's not much help if your connection is going from the other Houston airport.
Coming from Austin I had to use the highway round Houston to get to George Bush. They'd set up automatic tolls (requires an e-pass). If you don't there's no way to pay. I hadn't time for an adventure through the city so thought "government car surely they're exempt" and carried on. Not a chance, Debbie was feeling very smug as she held up the paperwork for a fine and costs and told me that it would come off my expenses. Luckily I had a few extra receipts that I normally wouldn't have claimed but this time she got the lot.