In the seaQuest 2032 season 3 episode "Spindrift":
LT. James Brody is killed while attempting to rescue Lieutenant Henderson.
However, in "Brainlock", aired after Spindrift
Brody is alive and an active character in the episode's plot.
According to Wikipedia's List of seaQuest DSV Episodes, the episode numbers and air dates of "Sprindrift" and "Brainlock" are opposite. "Brainlock" was produced prior to "Sprindrift", thereby maintaining continuity of a very important event affecting the story, however they were aired in opposite order.
"Spindrift" (#51): aired November 8, 1995
"Brainlock" (#50): aired January 12, 1996
Why did NBC air the episodes out of order?