The Boy Who Lived is getting a proper ’90s backdrop. While HBO’s Harry Potter series is still a long way off from its 2027 debut, sharp-eyed fans who turned out to watch filming in London a few weeks back noticed something unexpected on set: posters advertising Nirvana’s UK tour plastered across the walls of Borough High Street. The blink-and-you’ll-miss-it detail might not mean Kurt Cobain is suddenly canon in the wizarding world, but it’s a strong hint at the time period the show is embracing.