Already well received, the film will now compete against four other finalists for an Academy Award on Feb. 27.
Nuon Chea is now awaiting an atrocity crimes trial at the UN-backed Khmer Rouge tribunal.
Professor Sum Chhum Bun says the literature, arts and culture during the regime were used for Marxist-Leninist ideology.
The film, which is shortlisted for the Oscars and recently screened in many theaters in Washington.
At least 20 different Cambodians have shown their work at the gallery.
It has been screened for professors of political science, human rights, law, genocide and Southeast Asian studies over the past weeks.
Two toddlers, aged three and four, were saved from drowning, authorities confirmed early Tuesday.
The festival of boat races will last through Monday, when the moon is full, the largest collective revelry in the Cambodian calendar.
The scene in question shows a group of masked, wealthy businessmen bidding for a beautiful woman. A man takes her for $5 million.
The film won the Special Jury Prize at the Sundance film festival in January and has been released in the US, Europe and Asia.
Today this Buddhist temple is tranquil, but when the Khmer Rouge ruled Cambodia between 1975 and 1979, it was anything but.