The most jarring structural flaw in this surah is a sudden, frantic break in the narrative where the text stops speaking about cosmic resurrection to give Muhammad real-time instructions on how to memorize his lines.
Surah 75:16-19:
Move not your tongue with it to hasten with it. Indeed, upon Us is its collection and its recitation. So when We have recited it, then follow its recitation. Then upon Us is its clarification.
Islamic theology claims the Quran is a pristine copy of an eternal heavenly tablet. Yet, right in the middle of a sermon about the Day of Judgment, the text undergoes a total narrative derailment.
According to Sahih al-Bukhari 5, Muhammad was panic-whispering and moving his tongue rapidly during revelations because he was terrified he would forget the words Gabriel was saying.
To fix this immediate psychological anxiety, the author inserts four verses directly into the eternal text to tell Muhammad to calm down and stop moving his tongue. Splicing a private, 7th-century reading lesson into what is claimed to be a universal cosmic decree is a major structural inconsistency.