Mr. Rabb Goes to Washington - S4-E8
Continuity mistake: The lone shark's thugs break down Mac's door trying to get to her husband, Chris Ragle, who is hiding in her apartment. Although the door is splintered to pieces, later that night, the same door is back in perfect condition, including the custom paint job that matches the interior decor of the apartment.
Chosen answer: When landing on an aircraft carrier, a pilot "calls the ball" by confirming to the landing signal officer (LSO) that they have the carrier, and more specifically its landing guidance systems in sight. Carriers use a Fresnel lens system which is a light only visible at a certain angle, so if a pilot sees the "ball" they are at the correct altitude and glide slope for landing.
Sierra1 ★