As part of own education, as well as keeping our construction partners up to speed, we will often go out and look at homes during various phases of construction. What we find sometimes amazes us. It is often shoddy workmanship that can rob a home of vital energy savings. In the following pictures, you can easily see some areas where while improvements have been made, there is still much work left to do from the various trades.
There will be zero protection of this water pipe from cold temps as the insulation has been compressed to a worthless level.
I would be very interested in hearing about things you might have seen in construction that was in error. With visibility and training to the subs, many of these errors can be easily fixed.