When you’ve seen “Grey Gardens” as many times as I have you stop laughing at the funny parts (okay, you never stop laughing at “Tea For Two”) and begin to really uncover the sadness of the story. Little Edie is so insecure — watch the way she grits her teeth or looks down at her fingernails whenever her mother talks about her. Or the way she laughs like she’s letting you in on a joke as she dances (dancing being her only true passion, along with swimming and the Catholic Church.) Every time I watch “Grey Gardens” I discover ten new things (having the subtitles on helps a lot) — this time I caught a little dig Big Edie slipped in concerning Jack Kennedy’s penchant for underage girls. But with each discovery comes new questions. Big Edie, when agitated, slips up and gets almost specific about “what happened in New York.” Was Little Edie raped? Why does she get so angry at the suggestion that her mother was “helped out” by anyone other than her absentee father? Why does Little Edie eat ice cream with a knife? It seems — it seems at times that Big Edie is so sharp, yet can’t she see what her attitude is doing to her daughter? Or is it planned? Does Big Edie resent Little Edie? Hate her? Want her to remain an emotional mess in a dilapidated house overrun by raccoons? I think I need to watch this a sixth time.