Ari and Toula pass South Melbourne Town Hall in the taxi on their way to Three Faces nightclub. 

South Melbourne Town Hall is located at 208-220 Bank Street, Melbourne.

Ari and friends drop Betty off at Flinders Street Station at the beginning of their night. 

Ari has sex in an alley adjacent to the Footscray Markets. The following scene shows him walking through the markets proper, and out onto Leeds Street, where the "Hellenic" building is visible.

After spending the night at his brother's house, Ari and Shawn spend time at a diner. Shawn then walks Ari to the tram on Lygon Street, Carlton. Coordinates have been given for Lygon Street.

Johnny and Ari are taken to a police station, where they are forced to remove their clothes and, upon resisting, Johnny is beaten. Narratively, this occurs shortly after they pass the South Melbourne Town Hall. Coordinates have been given for the Prahran Police Station on Malvern Road, but are an estimation. Shooting location is unknown.

Ari and friends go the fictional Greek Club, The Steki (or Stekki). From the club they travel south to Three Faces. Coordinates have been given for Carlton, a suburb north of Melbourne, and are an approximation. Shooting location for The Steki is currently unknown.

The site of former gay club, Three Faces (and, more recently, The Market), is now occupied by restaurant and club, The Emerson.

The Emerson is located at 143-5 Commercial Road, South Yarra.

Stephen Russell talks about the closure of The Market (formerly Three Faces) here: http://www.au.timeout.com/melbourne/gay-lesbian/features/337/the-market-closes

The Emerson: http://www.theemerson.com.au/

The West Gate Bridge and Port Melbourne feature towards the beginning of the film, where Ari shoots up, before Ari visits Toula and at the film's end, when Ari dances on the docks at sunrise.