On the red carpet at the Toronto International Film Festival, “Riverdale” star KJ Apa shares with Access guest correspondent Mike Catherwood a little teaser of his impression of ’90s “90210”-era Luke Perry. (Note: KJ is set to play a younger version of Luke’s character, Fred Andrews, in an upcoming Season 3 episode of “Riverdale.”) Plus, KJ tells Mike about his new film, “The Hate U Give,” and why he thinks co-star Amandla Stenberg will impress audiences.