The "interesting feature" you're seeing in the title of that specific Blu-ray rip likely refers to the included in the 2020 South Korean horror film's release.
“The creature design is really interesting and it has a surprisingly heartfelt story.” Reddit · r/horror · 4 years ago Closet, The (2020) Review | cityonfire.com subtitle The.Closet.2020.1080p.GER.BluRay.AVC.R...
: Reviewers often highlight the film's "interesting" blend of traditional shamanism with a modern emotional story about dysfunctional family dynamics. Community Perspectives on the Film The "interesting feature" you're seeing in the title