As for cognition, the book is a reminder, or a message, that humans have imperfect memories and we must use outside factors rather than obsessing an idealized form of godlike memory.
Here's some quotes from the book notes of Seeking Wisdom by Peter Bevelin:
"Take all the main models from psychology and use them as a checklist in reviewing outcomes in complex systems." 
"It's a great overview of the lessons of Charlie Munger (partner of Warren Buffett) - and his approach to checklists of multi-disciplinary models to guide clear thinking" 
"Simplify and standardize processes, and use checklists to decrease the likelihood of operator errors."