Jack melts the barrel off of Doc's pistol yet in a later scene Doc pulls his pistol out of its holster and it's in one piece again.
Waverly implies that ethyl alcohol smells like gasoline. When Holliday mentions liquor, Dolls says ethyl alcohol is not used in liquor. Ethyl alcohol, also called ethanol, is the defining feature of alcoholic drinks. The writer probably confused it with tetra-ethyl lead, formerly a common additive in gasoline, often referred to on the pumps as "ethyl".