Sound design is often underestimated but is crucial in trailer editing. Common mistakes include using overly loud or distracting sound effects, which can overwhelm the visuals and detract from the narrative. Another standard error is failing to properly sync sound to the visuals, making the trailer feel disjointed. Music choice is also a key factor—selecting the wrong track can undermine the emotional tone of the trailer. The best trailers use sound to enhance the storytelling, so it’s essential to balance music, sound effects, and dialogue for a smooth, engaging experience that resonates with viewers.