Continuity mistake: When the CTU units arrive with the helicopter, they ask Teri to drop the weapon. She puts down the weapon, than it is a cut to a view from behind Teri and she still has the weapon in her hand, but is starting bend to put the weapon down.
Continuity mistake: In the scene where the CTU tactical team arrives at the 'lz', the chopper that first makes ground contact is marked "CTU-1", and offloads six federal agents in full tactical gear. Later in another shot of the same scene, you see "CTU-1" marked on a second chopper still circling in the air. It's clear this is not the same chopper as before, as we see the first "CTU-1" on the ground again moments later.