Not having read the 'duolingo good morning story', I imagine that if it's well - made, an interesting part could be how it weaves in grammar and vocabulary lessons seamlessly into the narrative. For example, it could use the morning activities to teach verb tenses. Say, 'I woke up (past tense) early this morning and am now having (present continuous) my breakfast'. This would make learning language more engaging and natural for the learners.
I haven't actually read the specific 'duolingo good morning story', so I can't share its interesting parts directly. But generally, it could be interesting if it has unique descriptions of morning scenery like 'The sun peeked through the curtains, casting a warm glow in the room' in the target language.