When Jules is trying, awkwardly, to explain the reasons that lesbians might prefer to watch gay male pornography rather than porn showing two women together, one of the reasons she gives is that they always cast two straight woman pretending to be gay in those movies. Both Julianne Moore, who plays Jules, and Annette Bening, who plays Nic, are in their real lives straight actress pretending to be lesbians for this movie.
Filmed in 23 days, because the creators had rushed post-production so it would be finished in time for Sundance. Even though it was admitted after the deadline, the movie became one of the breakout hits of the festival.
Although this movie only played in 7 theaters during its first weekend of North American release (3 in New York City and 1 each in San Francisco, Chicago, Toronto, and Los Angeles), in terms of per-screen average, it was the box-office winner for the weekend.
Jules (Julianne Moore) has a tattoo on her left wrist that reads JLN. This stands either for "Jules Loves Nic" or "Joni Laser Nic". The ink can most easily be seen about twenty minutes into the film when Jules and Nic are watching "Locked Up Abroad."