While filming the scenes at the power plant, Kiefer Sutherland bruised his forehead on a pipe. If you look closely you can see it at the beginning of this episode despite the makeup.
On January 20, 2002, Kiefer Sutherland won a Golden Globe for best actor in a television drama. The series was also nominated, but didn't win.
Elisha Cuthbert couldn't run in the sandals so the costume department painted sneakers to match.
It is established in this episode that Jack has been awake since at least 8:00 a.m. the previous day.