Mark refers to "that new thing, ice cream". Not only had ice cream been around for a long time, home hand cranked ice cream makers were introduced in the 1840's, long before this show takes place. Lucas and Mark made ice cream together in their cabin in the first season with such a wooden, hand-cranked model.
When Lucas turns the body of Gordo (Lon Chaney), he rolls it about half way and the supposedly dead body flings its arm over and rolls onto its belly.
When Micah and Lucas come back to the jail after the deputy is found dying in the alley, Charlie Gordo tells them Nils told him about the killing. Nils wouldn't have known that while guarding Gordo.