Roofer may have forgotten to properly place a nail while installing so it was improperly nailed from the top.
Railings and Balusters
This doesn't appear to be wrong but balusters should be no more than 4 inches apart to prevent children from getting their heads stuck.
Sanitary Pump Not Attached
Sanitary pipe was not attached and was filling crawl space with toilet water.
Ventilation Not Channeled to Outside
Bathroom vents should be channeled to the oustside of the home. Humidity that stays in the attic can be the cause of mold and mildew in the attic space. In this case, vent hoses were pointed towards a roof vent but are not properly attached to exit the attic.