The common mistakes are forgetting a debt, forgetting a certain stream of income, not disclosing to the attorney helping you anything they need to know to prosecute your bankruptcy case (I use prosecute in a very loose sense, because it’s not an adversarial proceeding), and forgetting assets they you failed to put on your schedules. Other mistakes include trying to give gifts early in order to avoid having assets show up on your bankruptcy petition. You want to try to maintain the status quo prior to filing bankruptcy.