When they cut back from commercial at 8:42:49, there's an insert of Secretary Heller in his suit, but it was ripped off of him by the terrorists at 8:35.
When Andrew Paige is in the Subway station and Jack Bauer and the other agents are looking for him, a subway sign overhead has the track times and subway tracks listed - all of them are afternoon times starting from 3:45PM to 4:30PM.
When the blue Lexus drives through the gate at the train station parking exit, the car breaks the gate arm and it falls down. In the next shot, the fallen gate arm is disappeared.