Doctor Bashir, I Presume? - S5-E16
Visible crew/equipment: Just before Zimmerman stands up in Sisko's office, the boom microphone can be seen above Robert Picardo's head. It pulls up out of frame just as he gets out of the chair.
Doctor Bashir, I Presume? - S5-E16
Visible crew/equipment: Just before Zimmerman stands up in Sisko's office, the boom microphone can be seen above Robert Picardo's head. It pulls up out of frame just as he gets out of the chair.

Broken Link - S4-E26
Revealing mistake: During the fight between Garak and Worf near the end of the episode, a Jefferies tube door is knocked out of its frame to reveal the end of the set - a dark room with a wooden scaffold and various other pieces of equipment (slow-mo helpful but not required). (00:36:00)
The Way of the Warrior (2) - S4-E2
Question: What does Dax say to Worf when she first meets him? Where it loses something in the translation.
Answer: Worf: Curzon's name is an honored one among my people. Dax: (in Klingon) Yeah, but I'm a lot better looking than he was.
Sierra1 ★