Thumbsup identifies 7 key mistakes in short-form video production that cause viewer drop-off: weak opening hooks within 3 seconds, verbose introductions, static camera work, missing or poorly-formatted subtitles, and others. The article emphasizes that retention and views depend more on content structure than algorithm luck, offering practical fixes like dynamic framing, B-roll layering, and proper subtitle placement—critical for Thailand's rapidly growing TikTok/Reels-native SME marketers.