Playing golf with clients is one way to 'mix business with pleasure'. [=to do something enjoyable that is related to your work]
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]
(..) not to the cops. Speak up, Baby. I... I like to listen back to conversations. I make music out of the words, songs, mixes. It's just something I do. That's one fucking dumbass excuse. To be fair, even the cops couldn't come up with an excuse that fucking dumbass. Now can you play us one of your mixes? I can't, they're... They're just... They're at home. Well, it looks like we're all going somewhere at in the morning, then. Come on. (..)2017 Baby Driver