When Kevin Grady erases Clark's entire memory, glimpses from all previous episodes of the show appear on screen, including Clark's journey to Earth and his last moment on Krypton.
The very fact that Clark's entire memory was erased by Kevin Grady's ability hints that a Kryptonian's brain can store vast amounts of information within a volume in which a human brain can just store the impressions of several minutes.
In this episode, Chloe finds out about the rest of Clark's abilities (X-ray vision, super hearing and heat vision). With this Clark rediscovers his abilities in a similar manner as when he initially discovered them.
When Clark reveals to Chloe that he's got X-ray vision, she covers her chest area. Lois did the same thing in "Infamous" when Clark revealed his powers to her.
Jonathan Bennett (Kevin Grady) co-starred with Tom Welling (Clark Kent) in Cheaper by the Dozen 2 (2005).