Due to the absence of any provided information regarding the film's content, plot, or characters, it is not possible to evaluate its portrayal of LGBTQ+ themes or characters. Therefore, no identifiable LGBTQ+ elements could be assessed.

Based on available information, the film 'Opouštět Petrohrad' does not appear to feature identifiable transsexual characters or themes, thus no specific portrayal can be assessed.

The movie does not contain any action or adventure elements.

The film does not appear to be an adaptation of a widely known work or historical event with pre-established character genders, nor a reboot of legacy characters. Therefore, no gender swaps can be identified.

This 1991 Czech TV film appears to be an original drama, not an adaptation of source material with pre-established character races or a biopic of a historical figure. Therefore, the concept of a race swap does not apply.