Just after Davis sedates Chloe and is rendered unconscious she is pictured slumped in a seat facing to her left. A few moments later she is seen slumped to her right and much lower in the seat. After a little more dialog she is seen more upright and leaning to her left again.
The flashback to the first time Clark and Chloe hung out takes place at most a year before the pilot took place. The actors who played them in the flashback were very clearly much more than a year younger than they were in season 1.