Suggestions by @Jeshisthename

Benjamin Wallfisch

as Composer in Who Killed JonBenét?

Gillian Flynn

as Writer in Who Killed JonBenét?

David Fincher

as Director in Who Killed JonBenét?

Denis Villeneuve

as Director in Who Killed JonBenét?

RuPaul

as Prudy Pingleton in Hairspray Live! (Miscasted)

Jason Nash

as Mr. Mistoffelees in Cats (Miscasted)

Trisha Paytas

as Victoria in Cats (Miscasted)

Ricegum

as Skimbleshanks in Cats (Miscasted)

Cameron Dallas

as Adult William Denbrough in It (Miscasted)

Susanna Fogel

as Writer in Ferris Bueller's Second Day Off

Darren Aronofsky

as Director in House of Horrors

Rose Byrne

as Aphrodite in Hercules

Tom Hiddleston

as Robin in Robin Hood CGI/Live Action

Robert De Niro

as Bill Sykes in Oliver and Company remake

Marc Shaiman

as Composer in Oliver and Company remake

Jon M. Chu

as Director in Oliver and Company remake

Patrick Warburton

as K. Edgar "Ed" Singer in Muppets from Space

Lee Hall

as Writer in The Secret of NIMH

John Bolton

as Bustopher Jones in Cats

Leslie Odom Jr.

as Macavity in Cats