Some of the secondaries (Cornell) had PDF files that could be filled out really easily. However, for most of the rest, I too used a typewriter for the one line answers (i.e. name, address, etc.) and cut out and pasted essay responses.
My 'screw-up' came with NYU in that the typewriter I was using had its correction ribbon crap out while I was filling it out. Inevitably, I made a whole bunch of mistakes and had to white them out. Needless to say, it was an annoying yellow color, and the closest white out shade wasn't particularly close. Ultimately, it looked pretty crappy, but I didn't want to wait to receive a second one.
It didn't matter, because they sent it back anyway because I didn't date my signature. Pretty annoying. Oh well.