On the Season 4 DVD, John Glover and Tom Welling revealed that while shooting this episode, John Glover would act out the scene while Tom Welling observed. They would then switch places and Welling would imitate Glover's mannerisms.
When Lionel (as Clark) hugs Martha (whom Lionel has long expressed attraction towards), he accidentally triggers Clark's Heat vision, much like how Clark first accidentally triggered his heat vision while thinking about sex in "Heat".
When Clark is speaking to his mother in the attic, actor Tom Welling has a cut on his forehead, which is partly covered by his hair; Clark Kent can't get injured unless under kryptonite.
The prisoner who plays "who wants to beat a billionaire" is the same as the one who shaved Lionel's head in "Covenant" as you can see his tattoo in both episodes.
Edgar notes that he was framed for embezzling a Princeton University account, possibly Lionel's doing, as Princeton University is his alma mater.