Clark says he can lease the back 40 acres to Ben Hubbard to cover finances. Hubbard is a character from the Superman: The Movie and Superman Returns who took over the Kent farm and cared for Martha when Clark left for Metropolis.
As Clark pointed out, Ares is indeed the Greek god of war (or more specifically, bloodlust). Ares is also a supervillan in DC comics and the archenemy of Wonder Woman.
Despite claims to the contrary in previous episodes, we learn that Lionel can indeed read Kryptonian.
Lois jokes that Clark wants to catch her in the shower again. However, Lois' memory is slightly inaccurate. She actually intruded on Clark's shower in "Gone". Lois could also be referring to a scene in "Fade" in which Clark sees her in the nude after coming out of the shower. This was however not at the Kent Farm, but when Lois resided at the Talon apartment.
The whole time Wes is said to be in the army, when Martha Kent hands Clark Wes' files, the folder has an Marine Corps emblem on it.