Apa broke his hand while filming the season one finale. "In a weird way, and I told this to KJ, the second we knew that Archie was going to be punching through ice, I literally said, 'Now guys, KJ is such a committed actor, he's so method, he's so in this character and passionate, you have to make sure he doesn't hurt this hand,'" Aguirre-Sacasa told ComicBook.com. "So when at the end of that day I got a phone call that KJ had maybe broken his hand, I was like 'Yup.'"
"That was a gnarly day of shooting, I'll tell you that much," Apa told TV Line. "I wasn't really punching the ice, but I got a little bit too excited. I was punching a foam mat … [that was] sitting on the ice. … It was cold, so I didn't really feel it. It wasn't until 20 minutes after that I realised I broke my hand. I didn't tell anyone."