In the comics, There was a male Dr. Teng at LexCorp. Teng developed the cloning process responsible for creating Bizarro, and later oversaw the cloning of Lex Luthor. Luthor eliminated Teng and his lab to hide the evidence of his rebirth.
Clark uses the following abilities in this episode: super speed, X-ray vision, and super hearing.
The Season 3 DVD contains two deleted scenes: 1.Clark tells Chloe that he is researching the street races, and Chloe tells Clark that Jason Dante flunked out of drivers training the first day by taking the instructor for a joy ride that left his instructor grabbing his inhaler. 2.Clark arrives at Dante's barn and finds his girlfriend locking up.
Actress Moneca Delain (Dante's girlfriend Mara in this episode) is also in Season Four episodes Devoted (where she's billed with the same name, implying it's the same character) and Unsafe (where her character is unnamed and is presumably a different character).
Velocity is the rapidity of a motion or operation. The title refers to the illegal street-racing Pete competes in.