Sam Mercer, producer on several M. Night Shyamalan movies and former head of ILM, died Feb. 12 of younger onset Alzheimer’s in South Pasadena. He was 69. Raised in Weston, Mass., he attended Occidental College and then started working as a location manager on 1980s classics including “Stripes,” “The Escape Artist,” “National Lampoon’s Vacation,” “Pee-Wee’s […]