I just paused Luke Cage season 2, at 32:33 into episode 6.
Without spoiling the content, 2 Jamaican men were talking and in response to a prompt, one of them said: "Me say war". It wasn't a response to a question or similar which would prompt a "Me say X" type of answer either, and proper English would be "I say", not "Me say".
The question I have is simple. If this wasn't a movie, would they have used a different language? I'm Norwegian and I will plead pretty ignorant about which language Jamaican people use.
By "movie language" I really mean "They picked English because most people would understand this, even though the actual people talking would probably use a completely different language that would require subtitles".
"Me say war" is pretty bad English, but yes, it would be understandable if a non-English speaker would respond to someone they only know would understand English (of the languages they would have in common), but it sort of stuck out like a sore thumb to me.