Clark says the same thing to Connor that Jonathan said to Clark in Season 3 Episode 1 when Clark was under the influence of red kryptonite.
Initially in the comics Conner Kent was genetically engineered meta human clone of human origin created by Project Cadmus as a duplicate and closest genetic equivalent of Superman. He was retconned in Teen Titans vol. 3, #1 (September 2003) as a Kryptonian/human hybrid of Superman and Lex Luthor. The New 52 version has DNA from 3 sources.
One of Lionel's scientists tells him that Lex's remains, which Tess had given to Lionel, came from one of the other clones. As all the clones would be genetically identical, there would be no way of knowing which clone it was.
In the comics, Superboy has DNA from both Lex and Clark, as does Connor in this episode
Conner discovers his power of heat vision when he is aroused by Lois' physical appearance, much like in Season Two's "Heat" when Clark first discovered his heat vision when he saw Desiree Atkins during a sex-ed class and Lana Lang at the Talon after Lex's first wedding. Also in Season Four's "Transference" when the original Lionel (while in Clark's body) hugged Martha Kent and in Season Seven's "Fierce" when Kara first saw Jimmy Olsen.