At 7:00 a.m. Heller is very cleanly shaved, but by 1:05 p.m. he has what appears to be a two-day beard. Between 2:00 and 3:00 p.m. he is alternately clean-shaven and stubbly from scene to scene. These same discrepancies apply to all the men including Jack, who was stubbly at 7:00 (all dressed up in a suit), but seems to find time to shave during his busy day saving the world.
At 12:54 p.m. Audrey is shown in her original outfit of burgundy skirt suit with a white top underneath using a computer at C.T.U. At 1:00 p.m., she is still at the computer but in a completely different outfit - a pink sweater, pants, and a suede jacket.
Marianne tells Henry Powell that Jack and Audrey are at 357 White Oak Blvd, however, when she calls the security company up on her screen, the location is given as 457 White Oak Blvd.
When Jack killed one of the terrorists in a hallway inside Felsted security, he could've taken his weapon in case if he should run out of ammunition.