Suggestions by @kylewhite

Sam Raimi

as Director in Gremlins (1994)

Score: +3

Dee Wallace

as Lynn Peltzer in Gremlins (1994)

Score: +2

Mary Steenburgen

as Lynn Peltzer in Gremlins (1994)

Score: +3

Elaine Stritch

as Mrs. Deagle in Gremlins (1994)

Score: +3

Phyllis Diller

as Mrs. Deagle in Gremlins (1994)

Score: +3

Barry Corbin

as Rand Peltzer in Gremlins (1994)

Score: +3

Alyson Hannigan

as Kate Beringer in Gremlins (1994)

Score: +2

Jerry O'Connell

as Billy Peltzer in Gremlins (1994)

Score: +3

Freddie Prinze Jr.

as Jason Stone in Mars Attacks (2006)

Score: +4

Kristen Stewart

as Taffy Dale in Mars Attacks (2006)

Score: +6

John Lithgow

as Art Land in Mars Attacks (2006)

Score: +2

John Lithgow

as President James Dale in Mars Attacks (2006)

Score: +2

Jason Alexander

as Rude Gambler in Mars Attacks (2006)

Score: +4

Don Adams

as Dr. Rumack in Airplane! (1990)

Score: 0

Bill Melendez

as Snoopy in Sam Raimi's Who Censored Roger Rabbit? (1986)

Score: +1

Lorenzo Music

as Garfield in Sam Raimi's Who Censored Roger Rabbit? (1986)

Score: +1

Parker Posey

as Betty Rubble in The Flintstones (2004)

Score: +2

Dee Bradley Baker

as Dino in The Flintstones (2004)

Score: +1

Rob Paulsen

as Cameos in The Flintstones (2004)

Score: +1

Joseph Barbera

as Executive Producer in The Flintstones (2004)

Score: +2