Urban myths, modern sailors myths; little difference. These from the OED.

Footloose first appeared in print in 1873; J. H. Beedle, "Undeveloped West," "All my friends who were 'foot-loose' had the Arizona fever."

Dressing down first appeared with regard to the army. To castigate, by words or blows. 1769, "10th Rep. Hist. MS Comm.," "For this he got a very severe dressing down..."

Bitter end origin is uncertain, the first quote known is from 1849, "Congress. Globe," ".....voted for the gentleman from Indiana, even to the bitter end." Some similar quotes refer to suffering.
Etc.

On the other hand, the reference to skyscraper is correct.