[SAI_Peregrinus]

Among EEs that I've seen there are only really three points of controversy: the "any current at all turns the bulb on" bit which he didn't mention in the initial pre-video quiz (but which is super important), that he missed the unit of meters in the `1/c seconds` answer (it should be `1m/c seconds`), and (for the pedants & puzzle solvers) that he ignored the interesting bits about steady state behavior.

Nothing (except forgetting the units of meters) he said is wrong. It's just a bit uncharacteristic that the video didn't match the initial quiz, and it ignores some of the most interesting bits of the behavior. But it wasn't targeted at EEs who are already familiar with the "simple" transmission line behavior, it was targeted at people who haven't ever learned or dealt with that. So the steady-state behavior would have distracted from the focus of the video IMO.

[tsimionescu]

There's also the problem of the switch: Derek's arguments still work for the circuit with the switch still off, since the battery doesn't stop producing an electric field just because the switch is off.