I visit some partially built homes from time to time, and recently saw one just after it had been inspected. On one wall, on the insulation, the inspector had scrawled STUD? In red felt.

The stud was completely missing from the wall. It was just an empty frame filled with insulation. You’d think someone would have noticed earlier during construction, but obviously the actual contractor had just let the day labor go to town and never bothered to review their work before inspection.