Walmart advertisement in a new interview. “I don’t know; I guess I wasn’t that excited about doing a commercial if I’m being totally honest,” McAdams, 45, told Variety while promoting her new film “Are You There God? It’s Me, Margaret” on Wednesday.”A movie sounded awesome, but I’ve never done commercials, and it just didn’t feel like my bag,” the Oscar nominee continued. “Also… I didn’t know that everyone was doing it.