I audited 30 Shopify stores last month and they were all making the same 5 mistakes on their PDPs: 1. No confidence building copy under the product name. Most PDPs jump from product title straight into size, color, and quantity. People are being asked to choose before they even know why they should care. Add one or two sentences right under the product name that explain what it is and why it matters. People justify emotionally first, rationally second. 2. Critical decisions buried in dropdowns. Size, frame, color hidden in a dropdown is a silent conversion killer. It forces shoppers to imagine the outcome instead of seeing it. Use buttons or tiles instead. Separate decisions visually. Show scale or context. 3. Review widgets that don't actually build trust. A "4.8 stars from 200 reviews" badge does almost nothing. What converts is verified buyer badges, customer photos, structured sizing feedback, and reviews that address real objections. Most stores have the right apps installed. They just never set them up properly. 4. Shipping costs hidden until checkout. Unexpected costs at checkout are the #1 reason for cart abandonment (Baymard). Show shipping early. "Free over $X" or "Calculated from $X" on the PDP or cart drawer makes a real difference. Fix one and you'll see lift. Fix all four and you're looking at meaningful conversion gains in 30 days.