"Sometimes I sign off on it, sometimes I make them fix it. Either way, I'm accepting full liability as the responsible engineer. That's why I'm paid the big bucks!"
Good description of what is involved with working as a PE, I spent many years working with large engineering groups, and they are usually a mix of a few PE's a much larger number of  Electrical Systems Designers, and a constant changing number of EIT's.
One thing i noticed over the years, was many in the Drafting group, would have all the  building code books handy, and they did reference all the codes, not just the electrical, if there was a design problem, they had the PE's on staff ready to assist.
IMO what is all comes down to is, keeping the lines of communication open on any project, If a problem is found with the design bring it to the engineers attention and work together to resolve it, everyone wins.