This was the third Old Navy my girlfriend and I visited in a weekend in order to find a specific pair of shorts in her size. Luckily, they had the shorts, but not in the color she wanted, but she settled on another color. The fitting room person was nice and didn't ask for a name and amount of clothes to write on the outside of the door like the other stores. I can understand amount of clothes, but I think writing your name on the door is a bit strange.
The checkout service was much less than desirable. There were two checkout girls, helping one customer each with only a few articles of clothing. It took us 20 minutes to get the people in front of us so we could be rung up. The checkout girls kept going back and forth between each other and the customers on what the sale criteria stated and how to actually ring it up. It took one girl 10 minutes to ring up 2 sets of socks.
However, I don't blame the people. I think the problem stems from the way their systems work. For example, the promotion will be "Buy one, get the second half off." But it's rung up as 25% off both items instead of one item full price and the second 50% off. Strange.