These people have appeared in more than one Mary-Kate and Ashley movie, television series, or video! I might add pictures later, but it's just information for now.
Bob Saget played Danny Tanner, Michelle's father and co-host of "Wake Up San Francisco," on Full House. He also played the co-host of "Win-O-Lotto" in To Grandmother's House We Go.
Lori Loughlin played Rebecca Donaldson-Katsopolis, Michelle's aunt and co-host of "Wake Up San Francisco," on Full House. In To Grandmother's House We Go, she was a co-host of "Win-O-Lotto."
Candace Cameron was D.J. Tanner, Michelle's older sister, on Full House She also played an audience member on the "Win-O-Lotto" show in To Grandmother's House We Go.
Andrea Barber played Kimmy Gibbler, the Tanners' neighbor and D.J.'s best friend, on Full House. She also played an audience member on the "Win-O-Lotto" show in To Grandmother's House We Go.
Sam Saletta played Butch, a bully who picked on Alfalfa and the gang, in The Little Rascals. He also appeared in Billboard Dad as Ryan, a friend of Emily and Tess.
Ernie Grunwald played Harry "Dad" Butkis, Sr., the father of the family who wanted to adopt Amanda in It Takes Two. He also played Paul, a compulsive liar who was Professor Burke's student and Carrie's friend on Two of a Kind.
Eric Lutes played Sam and Emma's father in Switching Goals, and he also played Chloe and Riley's father on So Little Time.
Brandon Tyler played Brian, the object of Riley's affection, in Winning London. He also appeared on So Little Time as Travis Morgan, Riley and Chloe's friend.
In both Winning London and So Little Time, Rachel Roth played Rachel, Riley and Chloe's friend.
Ben Easter played Jordan Landers, a worker at the resort and Alex's boyfriend, in Holiday in the Sun. He also played Lennon, Chloe's boyfriend, on So Little Time.
Billy Aaron Brown
Billy Aaron Brown played Scott, a guy interested in Madison, in Holiday in the Sun. In Getting There he was Danny, a friend of Kylie and Taylor's, but he wanted more than friendship with Kylie.