Find the Trashin' the Camp scene. It's when Turk is playing with the typewriter. She hits it only a couple of times and (as another mess up entry said) it goes from right to left. Also, she only hits like 4 keys and then it dings. Then just after that, she hits a whole bunch of keys (at least 3 times as many) before it dings.
I thought that maybe the first time Terk started playing with they typewriter, it was in the middle of the page or something, as if someone had been using it earlier. Then, after Terk set it back to the beginning of the line, there would be more typing before it "dinged" again.