What if I Don't Hear the Crunch Sound with Botox? Does That Mean It Was Not Injected Deeply Enough?

The only place that I would expect that you might hear this sound is on the forehead but it is not part of the treatment and not necessary for success. I think that a sharper needle might have less crunch to it. 

The presence or absence of a crunching sound has no correlation with the efficacy of the Botox injected; this sound is caused by penetration of one or multiple durable, sliding tissue planes in the forehead.  The frontalis muscle, which produces the horizontal forehead lines, lies immediately deep to the subcutaneous brow fat.  Injection into or superficial to the muscle does not seem to correlate with result.

Having the expectation that you should hear a "crunch" sound when receiving Botox injections to your facial muscles is incorrect. Sometimes it occurs, and sometimes it doesn't. It has no bearing on whether or not the treatment was injected at the right depth, that is completely injector specific, and certain muscles lie deeper than others.