Suggestions by @kylewhite

Daniel Stern

as Roman Craig in The Great Outdoors (1998)

Score: +1

John Goodman

as Chet Ripley in The Great Outdoors (1998)

Score: +1

Peter Hyams

as Director in Poltergeist (1992)

Score: +1

Jason Alexander

as Jim Neiman in Whiplash (2014)

Score: +2

Howie Mandel

as E.T. in E.T. the Extra-Terrestrial (1992)

Score: +4

Alan Silvestri

as Composer in E.T. the Extra-Terrestrial (1992)

Score: +4

Bob Gale

as Writer in E.T. the Extra-Terrestrial (1992)

Score: +1

Robert Zemeckis

as Writer in E.T. the Extra-Terrestrial (1992)

Score: +2

Steve Starkey

as Producer in E.T. the Extra-Terrestrial (1992)

Score: +1

Robert Zemeckis

as Director in E.T. the Extra-Terrestrial (1992)

Score: +2

Jason Marsden

as Greg in E.T. the Extra-Terrestrial (1992)

Score: +1

Scott Weinger

as Steve in E.T. the Extra-Terrestrial (1992)

Score: +1

David Faustino

as Tyler in E.T. the Extra-Terrestrial (1992)

Score: +1

Jeff Daniels

as Keys in E.T. the Extra-Terrestrial (1992)

Score: +4

Scott Bakula

as Keys in E.T. the Extra-Terrestrial (1992)

Score: +3

Lindsay Lohan

as Gertie Taylor in E.T. the Extra-Terrestrial (1992)

Score: +4

Johnny Galecki

as Michael Taylor in E.T. the Extra-Terrestrial (1992)

Score: +3

Kim Cattrall

as Mary Taylor in E.T. the Extra-Terrestrial (1992)

Score: +2

Ben Diskin

as Elliott Taylor in E.T. the Extra-Terrestrial (1992)

Score: +1

Elijah Wood

as Elliott Taylor in E.T. the Extra-Terrestrial (1992)

Score: +9