TOD, the sequel:
Ruth Gordon -- ROSEMARY'S BABY, WHERE'S POPPA?, and WHAT EVER HAPPENED TO AUNT ALICE? -- which I don't recall seeing, but I intend to like her in it when I finally do. Never warmed up to HAROLD AND MAUDE (only saw bits and pieces on TV back in the day) but might actually give it a try sometime.
John Cassavetes -- ROSEMARY'S BABY, TWO MINUTE WARNING (I think), HUSBANDS. Probably more I'm forgetting.
And for a bonus response: Sidney Blackmer -- ROSEMARY'S BABY and the PREMATURE BURIAL episode of THRILLER. I feel I've seen him a few other times, am totally blank on what those things are, but wanted to give him a shout-out.