Failing to method act the other person completely in the beginning
Refusing to admit positive benefits of the model
Not changing your filters and values to match the model
Becoming judgmental after modeling when attempting to integrate the information, therefore throwing out important points in favor of your previous beliefs.
Forgetting where you learned the information in favor of believing it is just part of your personality from birth or some such nonsense.
Be good at method acting the examples you are using in your head.
Do it with the same emotions the example is using, the same attitudes, values, beliefs, strategies, and actions.
Then, consider your overall outcome and adopt those traits and factors that get the outcome to take place while keeping the other situations in your life relatively stable.