The Cigarette Smoking Man (played by William B. Davis) only smokes Morley cigarettes. Rarely seen without a cigarette in his hand, the CSM was originally intended to be a non-speaking character always lurking in the shadows, but he was eventually given dialogue and became the show's primary antagonist.

MacGyver works as a "troubleshooter" for the Phoenix Foundation in Los Angeles, a non-profit think tank that often cooperates with government agencies, particularly the police or intelligence community.

As an adult, Rupert Giles is a stuffy librarian and general authority figure, but as a young man he was rebellious and began to explore dark magic, earning him the name of "Ripper" from his friends.

McCall strides up to the poker table and shoots the famous gunfighter in the back of the head.

Aaron Sorkin wrote a special episode of The West Wing ("Isaac and Ishmael") that was filmed and broadcast within within just a few weeks of the September 11, 2001 terrorist attacks. The episode, which featured the lead characters discussing a terrorist threat upon the U.S. while being locked down inside the White House was not considered part of "West Wing" continuity.

During season five, Buffy's younger sister Dawn suddenly appears out of nowhere. Although she is new to the series, to the characters it's as if she has always been there. It is later discovered that Dawn was created as a "Key" in human form that has the potential to unlock a Hell dimension.

Joyce believes Will is communicating through pulses in light bulbs. She builds an alphabetic board on her wall with Christmas lights, allowing Will to sign to her that he is "RIGHT HERE" and that she needs to "RUN".

The Night's Watch guards the Wall to keep the wildlings and White Walkers from crossing into the Seven Kingdoms.

The extreme popularity of CSI: Crime Scene Investigation not only spanned 15 seasons and spawned multiple spinoffs, it also encouraged many young fans to pursue a career in forensic science.

In 1993, NYPD Blue became the first R-rated show in television history. Twenty-five percent of ABC's 225 affiliates chose to pre-empt the first episode.