1. Students at Hogwarts having their phones out.
Unless it's Albus's and Scorpius's generation, because then it makes sense with the time period. But, in the 1990s, iPhones didn't exist. NOW STOP SNAPCHATTING YOUR FRIENDS IN 1992! STOP INSTAGRAMMING IN THE MARAUDER'S GENERATION! BACK THEN, CELL PHONES DIDNT EVEN EXIST! NOW SHUT UP HORRIBLE FANFICTION WRITERS AND I WANT TO NOMINATE YOU FOR THE MARY SUE AWARDS!
2. Hogwarts students wearing Muggle clothes to class. THEY WEAR ROBES YOU IDIOTS.
3. Orbs for eyes.
Do I seriously have to explain this?4. Draco knowing Muggle songs?!
Draco doesn't know all the Muggle songs, don't pretend like he does. He's a pure-blood egotistical human being who thinks he's better than Muggles and half-bloods (and some purebloods) so why would he listen to Muggle music? It doesn't add up.