This was originally the fifth episode of the season, which is probably why Chloe seems reluctant to call Jimmy her boyfriend, as well as there being no mention of Lana's pregnancy, even though there is acknowledgement of Lex's proposal of marriage in "Static".
Level 3 was basically Lionel's own 33.1 before Lex took over and making and changing it into his own.
Jimmy mentions the "freaky vine lady", Gloria from "Wither" as a reason for Chloe to move away from Smallville.
It has been unknown who became Sheriff after Nancy Adams, but in this episode Clark refers to the sheriff as a "him" so it can be assumed that the new sheriff is now a male.
This is the second appearance of the bus station, the first being Season One's finale "Tempest".