After returning to her apartment at the Talon Chloe walks across the room wearing two earrings. As she stops and turns around to face Jimmy she is wearing only one earring and in the process of removing the one remaining earring.
When Jimmy is talking with Clark in the barn, his second button goes from being buttoned to unbuttoned, and back again.
At about 35 minutes into the show they show a shot of the Daily Planet from above, pulling away as from a helicopter. If you watch closely to the buildings to the right and bottom of the screens, the steam coming from the buildings is actually running in reverse and going into the buildings.
Near the end Chloe says "Well, Krypton 1989... give or take a few light-years." Light years are a measure of distance, not time.