In some instances (I haven't been able to pinpoint what I'm doing wrong) autotype starts typing information in the wrong fields. I also notice that if another program steals focus while autotype is executing, the info ends up in the wrong place. I've seen it, for example, send a password via AIM when someone sends a message just as autotype is executing. This is not a frequent occurrence. I use autotype about 20 times per day and it happens about once per week.
Making the process respond to ESC would be helpful to interrupt it if you see it going haywire.