Interviews are also (if not primarily) a measure of cultural fit. Making tasteful jokes is absolutely appropriate, but depends on the culture. I wouldn’t want to work at a place that is too uptight for some humor.

The UDP joke isn’t one that I’d probably use, but doesn’t feel out of place in the context of detailing the protocol.

I encourage you to find some thermal camera videos, and get some specs to do a bit of math for your own situation. Gas stoves typically create a BUNCH more heat, going up and around the sides of the pan/pot, while electric (of all types) is much more focused on the bottom surface. It’s also why electric is so bad for cooking in a wok.