The Bauer family, played by Kiefer Sutherland, Leslie Hope and Elisha Cuthbert were all either born or raised in Canada.
All cast members are required to have their hair trimmed every five days.
A Chicago Cubs mug belonging to Tony Almeida can be seen on-screen in seasons 1-5 - the reason for this being that actor Carlos Bernard is a big Cubs fan.
24 was ranked at #6 in Empire magazine's 50 Greatest TV Shows of All Time in 2008.
24 is Kiefer Sutherland's first regular role on a TV series, away from the big screen.
As of 2009, 24 is the only FOX series to win an Emmy for Outstanding Drama Series.
Xander Berkeley (George Mason) and Julian Sands (Vladimir Bierko) were no strangers to the real-time format of the show, having starred in Timecode (2000) - an experimental film which was shot simultaneously and continuously over a 90-minute period by four cameramen.