In 7-3 Michael makes up a batch of homemade Chloroform, which they use to sedate the zombies they tag. Chloroform was one of the original battlefield anaesthetics and was used to sedate patients being treated for gunshot wounds. It was introduced in the 1830s, used extensively in the US Civil War, and continued in use well into the 20th Century.

So in 14-2, when Michael operates on Saul's gunshot wound, and all they have for an anaesthetic is some whiskey, is this because 1) they were out of chloroform, 2) Michael didn't realize it could be used as a surgical anaesthetic, or 3) was that an oversight?