The play received 'mixed' reviews. = The play's reviews were 'mixed'. [=some critics liked the play, while other critics did not]
I accidentally 'mixed up' the two files. [=I put each of the files in the place where the other one should have gone]
He 'got mixed up in' a plan to destroy the government. [=he became involved in a plan to destroy the government]
(..) Hospital regulations. Get in there. All right. Thank you. All right. Careful, okay? No, don't! No! Hey, use the horn, fella. Let's try "mixed internal." Yeah. Switched to beer, huh? Go. Go. Go. You might want to switch to sake. Stop. Yeah. We need a doctor. Hai. (..)2003 Lost in Translation