If you took a little look offstage, beyond the glamour of the Shanghai International Film Festival’s gala opening on Saturday night, the very nature of this year’s program revealed itself in the cast and crew members gathered at the Shanghai Grand Theater. First-time director Keane T.K. Wong was on hand, his psychological drama Afterpiece having been chosen to open the big event — which runs across this sprawling metropolis until June 21 — and in the lead-up the Hong Kong filmmaker was quick to praise the support for emerging Chinese-language filmmaking talent, much of it on display at this year’s SIFF. “My first reaction was surprise,” Wong said of the selection. “For a feature film debut to be selected as the opening film of SIFF is a high recognition of the film and a great honor for me personally.…