If there is something glaringly obvious then we call to ask if it needs doing, if they say yes, they know it is going to cost extra.
Doing the 'little extra' is a nicety that is largely not necessary nor noticed by the customer. eg - for a new LA I thought I would impress by going the extra mile and there was a filthy dirty fireplace that wasn't itemised as needing doing, but i spent almost an hour cleaning it as I thought it would need to be done and as an added extra for the customer. When they inspected the property they thanked me for cleaning the fireplace but it was being boarded up the next day. Thanks a lot!
It may seem a little picky but I have been stung a few times and have had a few LAs take the p1$$ and miss stuff off the list when they know full well it will need doing.
As long as you are specific on what will and what won't be done from the start of the working relationship then there is no room for misunderstanding on either side.