A good anti-pattern has 2 elements:
1. A repeated pattern of action that appears beneficial, but ultimately produces more bad consequences than beneficial results.
2. A refactored solution exists that has been proven in actual practice and is repeatable.
So, what are common pitfalls that new (or even experienced) agile practitioners fall into? Learning about and watching out for these anti-patterns is a great way to inspect and adapt your agile practice.