Mazes and Monsters (1982) IMDb
Despite slow sequences of cave delving and escalator searching, it is indeed appropriate for group viewing and mocking. I wish I was level 9.
The real story of James Dallas Egbert is tragic and has no material relationship with D&D. William Dear, the private investigator who found Egbert, lied to protect him from the media, and people fell in love with the lie.
References here: Striking Vipers (2019).