Common mistakes with feature flags in e-commerce often involve a lack of clear strategy for their entire lifecycle, from implementation to retirement. Teams frequently accumulate too many unused flags, leading to significant technical debt and increasing the complexity of managing releases. Another critical error is insufficient testing, where not all possible flag combinations are validated, potentially introducing severe bugs or disrupting the customer journey. Furthermore, organizations often overlook the need for robust monitoring of flag impacts, making it difficult to quickly assess performance changes or detect issues in production. A common pitfall is also not tying flags to specific business metrics, which hinders the ability to measure the true success or failure of a deployed feature and informs future decisions. Lastly, neglecting proper access control and documentation can lead to unauthorized changes or confusion among development and operations teams.