When Chloe is hiding from the shooter in the laundry room, she locks the door and pushes a tumble-dryer in front of it. When the shooter works his way through the door and unlocks the door, he opens the door with a remarkable ease, implying that the tumble-dryer wasn't there anymore.
When Chloe is being shot at and calls CTU, they say that nobody can get to her within 15 minutes, then 10 minutes -- but it only took Chloe 5 minutes to get from CTU to the house she was at (she was still inside CTU at 1:50, arrived at 1:55) with the car driving at pretty slow speed, so Jack and Curtis could've gotten there themselves in under 3 minutes if they drove fast.
Approximately 19-20 minutes into the episode, while Jack is getting into position at the club the on-screen clock shows the time at 1:25 and some seconds. A few minutes later the camera is focusing on Marwan and the clock shows 1:23. This was fixed in the DVD version.
Logan: This is not my fault. None of this would have happened if Jack Bauer hadn't disobeyed my orders in the first place!
Novick: I'm sorry, sir, but if you are asking me to agree with that assessment, I can't. If it wasn't for Jack, we wouldn't have located Marwan.
For the third time this year, a former regular star (Dennis Haysbert) is uncredited upon their return. The producers obviously wanted Dennis Haysbert's return to be a surprise, but intense media coverage made it impossible.