The film 'The Postman Always Rings Twice' does not feature any identifiable LGBTQ+ characters or themes. Its narrative is centered on a heterosexual illicit affair and subsequent criminal acts, making the portrayal of LGBTQ+ elements N/A.

The film "The Postman Always Rings Twice" (1946) is a classic film noir centered on a heterosexual affair and murder plot. There are no identifiable transsexual characters or themes present in the narrative, nor does it explore any related issues. Therefore, the film has no impact, positive or negative, on the portrayal of transsexual individuals or identities.

The movie does not contain any action or adventure elements.

The 1946 film adaptation of James M. Cain's novel features all main characters, including Frank Chambers, Cora Smith, and Nick Papadakis, portrayed with the same gender as established in the original source material. No character's gender was altered.

The 1946 film adaptation of James M. Cain's novel features characters whose on-screen portrayals align with their established racial identities in the source material. No characters canonically or historically established as one race are depicted as a different race.