In the scene where Clark and Kyla go stargazing in his loft, she points out a star, which is now missing. This is a possible reference to Rao, as it was destroyed as part of Clark's origin story. It also suggests that it was less than 15 light years away, as otherwise it would still appear in the sky; however, Krypton is in another galaxy. Of course, Kyla's information is based on a 400 year old legend. As noted in Talisman, the story has been passed down verbally only and there are many interpretations. So, information held by Kyla should be taken with a grain of salt.
According to legend, the visitor from Krypton brought green rocks, that granted superhuman abilities. This would make the Kawatche tribe the earliest known case of Meteor Infection. It is unknown if this legend is true. It is also unknown if Kyla inherited her powers from a meteor infected ancestor, or if Kyla was herself exposed to Kryptonite following the 1989 Meteor Shower.
Clark uses the following abilities in this episode: super strength, super speed and Invulnerability.
Henry Small is confirmed to be Lana's biological father in this episode, not Lewis Lang as had previously been believed.
Clark learns the meaning of the symbols on the cave wall and the purpose of the ship's heart shortly afterward in Rosetta.