It's hard to unsee metamodern in movies once you see it. I did a 'self aware waldo' monologue in high school drama class, didn't realize it was meta modern.
Not a movie, but according to the wiki article linked a little further up the book “A Visit From The Goon Squad” by Jennifer Egan has metamodern qualities, and I heartily recommend reading it. It’s fantastic. The section in the format of a PowerPoint presentation about her brother that one of the main character’s daughter gives at her school is incredibly beautiful. One of my top five experiences reading.
A lot of modern movies are metamodern. The example on the Wikipedia is Bo Burnham's INSIDE, which is very metamodern. But I'd argue most movies are at least somewhat at this point self aware, fourth wall breaking commentary. Top Gun is an example of a modern movie - not metamodern, where there is diversity but it's not at all self aware, fourth wall breaking or commentary.
