 The actors read their lines from a transcript, and if you've ever read a transcript, it can look a little crazy because of how people talk. Inside-out sentences, false starts, incorrect grammar. I'll have done it while I'm talking to you, is whilst fluently talking to you, I will have jumbled words up, but because I've delivered it really fluently and sort of as if I believe in what I'm saying, your brain will have generously, like, rejigged it.