When making mini cream puffs, it is critical to avoid several common mistakes that could lead to disappointing results. One frequent error is not allowing the dough to cool sufficiently before adding the eggs, leading to scrambled eggs in the mixture rather than a smooth pastry dough. Another common mistake is opening the oven door too early—this can cause the airy puffs to fall flat. Additionally, not piping consistent sizes can result in uneven baking, where some puffs might be overcooked while others are undercooked. Lastly, ensure that all ingredients are measured accurately; for example, too much flour can make the dough heavy, and too little can make it collapse. By being mindful of these pitfalls, you can create beautifully puffed, light pastries every time.