Not really. They were test pilots with engineering training. They routinely talked to the engineers building a craft to give their feedback. And it's obvious that the pressure of the "space race" was reaching a critical point. There was little time to be elegant with needed solutions, and changes were made constantly. What is remarkable is how reliable the whole system was after that, even through the Apollo 13 accident.
They spent a year and a half making it better. The Block 1 Apollo never even flew.
Von Braun turned back to the NASA brass and told them, "Gentlemen, I give you a reliability of 4 neins!"
Hehe.