From Fanlore, the fan run non-profit wiki about media fandom:

“Blooper Reel

A blooper is a mistake in filming, a misspoken word, a set mishap, a wardrobe malfunction, a continuity error, and/or deliberate clowning around by actors and production staff.

The collection of these bloopers, first on movie film, and later in other forms such as VCR tapes, is called a blooper reel or a blooper tape, or sometimes just, bloopers…..

…The Sentinel has a particularly famous blooper reel, which was also distributed via fannish tape circle. These bloopers featured not only many hilarious outtakes by all cast members, but was particularly known for its slashy vibe. The two main actors near-kissed and flirted a lot, often breaking up laughing during the show’s homoerotic scenes or making the show’s subtext into text. For instance, in one notable outtake from “Dead Drop,” in which Blair and others are trapped in a sabotaged elevator, Richard Burgi abandons his script to ask, “Blair, honey? Is that you? I don’t care about the others, let them all die, crushed like little ants, but are ‘you’ okay?”^[12]”

I wonder if The Sentinel DVDs will have the bloopers?