When Williard and the other two first start to eat the food their faces begin to turn bright red, to simulate the effect of the excessive spiciness causing their faces to be become flush. The effect was caused by a crewman turning on a bright red light and aiming it at them. However, the red light also gave their clothes a red color, showing the change in skin color was artificially induced.
Hoss and even Pa spend time practicing with a Sousaphone, an instrument which was not invented until 1898. They are, at least, using the early model with a bell pointing directly up like a tuba, known as a rain-catcher.