A mere plot synopsis might suggest the film is an exercise in grimness and that George is an unsympathetic, even monstrous, character, but Aldrich in fact treats much of the action as exceptionally black comedy and makes George the most sympathetic person in the drama, for the simple reason that she’s the only "real" person in a sea of fakes.
This idea of reality vs. fakery is one of Aldrich’s great themes, and nowhere is it more fully fleshed out than in Sister George. George, in spite of being in a career that calls for constant pretense, is disgusted by the lies by which everyone around her lives. She puts all kinds of spirit into her performance as the jolly Sister George, but she can’t pretend the values that character, and the series, espouse have anything to do with reality. Thus when Mercy Croft tells her how reassuring it is to see her character riding "cheerfully" through the village on her "little motorbike," Sister George cackles, "You’d look cheerful too with 50 centimeters throbbin’ away between your legs!" George’s unrepentant lesbianism – and unbridled sense of humor – make her ultimately the most attractive character in the film. Reid’s performance is complex and riveting, and in some moments heartbreaking, as during her famous three screams of "Moo" at the end (in reference to her presumed fate to move from playing Sister George to playing the part of Clarabell, "a flawed, credible cow.") The film also occasionally softens her hard edge in scenes with her dour prostitute friend Betty Thaxter and in witty sequences that show her music hall talent as she mimics Oliver Hardy and Sydney Greenstreet.
Aldrich always had a keen eye for publicity, and his decision to include a lengthy sequence in a real lesbian bar, the Gateways Club in London, nicely dovetails that impulse with his insistence on authenticity. (In this regard there’s a strong link to Sister George, who also insists on living authentically at any cost.) This was a novelty for audiences of the time, seeing lesbians dancing, flirting, and generally carrying on in a safe environment without any obvious disapproval from the film, and it generated considerable notice. But, unlike much of what passes for queer cinema at the time, the scene plays with drama and humor, but without sensationalism.
The look of the film also shows Aldrich’s powers as a formalist undiminished. In the opening sequence, we see George storming through the streets of London on her way home to, it’s hinted, exact revenge against some transgression by Childie. The camera seems to be oppressing, even crushing her, as she moves through cramped lanes, with walls visible on either side. Joseph Biroc’s photography constantly reinforces this feeling of oppression with an almost Sirkian sense of palpable doom through heavy shadows in the interiors. George and Childie’s flat is crowded with so much clutter the effect is suffocating. George constantly fights against this sense of suffocation; she’s frequently seen pushing or throwing things, trying to gain space for her expansive personality. Nowhere is this more evident than in the final sequence, where she demolishes the empty soundstage on which she worked, knocking over heavy lights and thrusting a casket – the one intended for her character – through a window. This occasions one of her most evocative lines as she lifts the featherlight casket and screams: "Even the bloody coffin’s a fake!"
The Killing of Sister George encountered numerous difficulties during and after the production. Susannah York bristled at the film’s most notorious sequence, an extended scene of lesbian lovemaking between Childie and Mercy Croft that was so raw it caused the film to be banned in several locales. Aldrich said that "Susannah was a bitch to her [Browne]" because she (York) simply didn’t want to do the scene, which involved blatant nipple-gnawing, sizzling kisses, and other upfront touches. Cameraman Joseph Biroc recalled how tense the director was during the shooting, which took much longer than anticipated. The scene even ended (for a few years) Aldrich’s work with longtime collaborator Frank DeVol, who quit the film in disgust. Still, there’s an undeniable erotic power there that made York’s discomfort a small price to pay. Unfortunately, between the time the film started and ended production, the movie industry had instituted a new ratings system: P, PG, R, and X. Largely on the basis of the lesbian love scene, Sister George received an X rating, which limited its exposure in theatres and thus its commercial potential. Aldrich’s lawsuit (he spent $75,000 battling the X rating) was ultimately dismissed, and the film died at the box office.
The Killing of Sister George remains an important work in Aldrich’s canon and a major contribution to early queer cinema, though some commentators have seen it as homophobic in portraying George as a monstrous version of a lesbian and Childie as a goofy, unevolved babydyke. But it’s ultimately less a comment on lesbianism (though it is that) than an exegesis of the human condition. Aldrich was right when he said "Sister George’s loud behavior and individuality . . . are encompassed in her personality, they’re not a product of her lesbianism. . . . She didn’t give a shit about the BBC or the public’s acceptance of her relationships. That’s why they couldn’t afford her." Like Aldrich himself, "she didn’t fit into the machine."