Pool play seeds are calculated as soon as scores are entered for a game in that pool. Once a score is entered the pool is calculated for seeding using the predefined pool rules selected when the event was created.
After creating and setting up your bracket updating the bracket is automated. Bracket positions are automatically updated after a pool has completed game play and for each game played within the bracket. The bracket will move the winner or loser to their new position without any manual help.
If a mistake was made in the bracket and a team advanced when they shouldn't of updating the correct result is easy. Just update the score of the game the mistake was made and the bracket will transverse all rounds after that game with the correct result.