On a ship that is so big there are bound to be a few things that have been overlooked or shoddily done. Nothing is perfect after all and we miserable human beings are prone to make mistakes !
The Board of Trade were interested in if the ship was fully seaworthy and that her engines, boilers, dynamos, steering gear, watertight doors, pumps, engine room telegraphs, navigation lights, firefighting equipment and lifeboats etc etc were all correctly installed and in good working order. And also that the cabins, passageways, public rooms and galleys were hygienic.
It was of no importance to the Board of Trade if here and there some paint was still wet, a few cabin heaters, fans or lights were on the blink or a dining room table wasn't quite level.
You may be interested in this deposition by a second class survivor called ImanIta Shelley. She seemed more concerned with criticising the unfinished second class accommodation amongst other things than the actual sinking.
Enclosed herewith find sworn statement of Imanita Shelley (Mrs. William Shelley) in regard to the Titanic disaster.
www.encyclopedia-titanica.org
There is a story (it may be apocryphal, or it may not be) of the delivery trip from Belfast to Southampton where Thomas Andrews was reportedly furious at discovering some vile anti-Catholic graffiti scrawled on one of the lower decks, left behind by the workmen.
Another possibly true (or not) story I've read is that steward Frederick Dent Ray found that a badly fitted carpet was making a door hard to open properly in one of the public rooms. So he got permission to cut a small part of the carpet out to allow the door to open easily. He had this bit of carpet in his coat pocket as he abandoned ship and the fragment eventually ended up being given away piece by piece as a kind of souvenir.