Hi I’m Katrina, I only care about television and there are seven actors that play roles on both Desperate Housewives and Mad Men

Mark Moses— Duck Phillips/Paul Young
John Slattery— Roger Sterling/Victor Lang
Kevin Rahm— Ted Chaough/Lee McDermott
Sam Page— Greg Harris/Sam Allen
Christine Estabrook— Gail Holloway/Martha Huber
Mason Vale Cotton— Bobby Draper/ MJ Delfino
Ann Dudek— Francine Hanson/Brandi

There is no overlapping crew. This seems to just be happenstance. It’s pretty fun though.

Upon further research, we have more.

Melinda McGraw— Bobbie Barrett/Annabel Foster
Melinda Page Hamilton— Anna Draper/Sister Mary