What are common mistakes in A/B testing that consultants help avoid?

Common A/B testing mistakes include stopping tests too early, testing too many variables at once, not having clear hypotheses, ignoring statistical significance, changing tests mid-run, not accounting for external factors, and testing low-traffic pages. Consultants help avoid these by establishing proper processes, training teams, and providing oversight. They ensure tests are designed correctly, run long enough, and analyzed properly. They help interpret results correctly and avoid false positives. Good consultants catch mistakes before they impact results. They also help prioritize tests to focus on high-impact opportunities rather than testing everything.