Good video, covers a lot of information that most people won't bother to ever learn. Basically, there are a number of factors that come into play to determine if an electric shock could be lethal. Depending on the field someone goes into, it can be a lot easier to teach them simple mantras. An electric lineman, for example, really needs to think about amperage flow as it is all low frequency (50-60Hz) and almost always high enough voltage (>100V) to be dangerous. Someone working on a low voltage logic board may never even consider their job dangerous.
Some things not covered but should be considered:
1. Dielectric breakdown is an effect, but one must consider that once an outer layer like the apple peel (or human skin for that matter) is breached, the impedance drops significantly. Put a plastic film over salt water, it won't conduct electricity well, but get the voltage high enough to get dielectric breakdown of the plastic film and burn a hole in it and the impedance goes WAAAY down.
2. Entry and exit points of the body are critical considerations as well. You can get serious electrical burns from voltages and currents (at appropriate frequencies) that are more than sufficient to normally kill a human, but even with these conditions you don't die. If the entry and exit points are on a single limb, for example, the likelihood of death is lower as the electricity does not travel through vital organs.
One thing I enjoyed seeing was the pickle experiment at about 6:40! We used to do this regularly at the company where I worked!
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