2022 was a year of immense growth for Internal Developer Platforms (IDPs) as over 1850 engineering organizations planned or already built their own platforms. However, many teams fell into common pitfalls such as prioritization fallacy, visualization fallacy, "wars you cannot win" fallacy, and others. To mitigate these mistakes, it's essential to prioritize correctly, avoid over-visualizing, centralize CI tools, start small with a real product mindset, abstract underlying technologies without restriction, design platforms for the weakest link in the chain, and avoid comparisons to successful companies like Google, Facebook, or Netflix. By being aware of these common fallacies and taking steps to mitigate them, teams can build more effective IDPs that improve developer productivity and overall organizational efficiency.