Which trick do you think would have a VERY small chance of happening in real life?
Was just re-watching all the episodes I only saw once and in episode 397 the culprit sets a phone to "vibrate," calls it, and it falls off a shelf and hits a computer mouse which in turn sends a e-mail so he can pretend that that was the victim who sent the e-mail. Yeah, right.
I'm sure there are others, just can't think of any right now.