One hole drilled incorrectly.  That was easy to fix.
All the cam lock screws on the upper section were too short by 1/2 inch.  
Had to buy 22 of the correct length from Home Depot to finish the assembly. (About $10)
The shorter screws supplied only worked on the lower section.  
Only one bag (44 screws all short) was supplied. Should have been bags of two lengths.