Gibbs states that rule #1 is "Never screw over your partner" but in the pilot Yankee White (2003) it is stated to be "Never let suspects stay together", which Gibbs also tells CGIS Agent Borin in the season eight episode Ships in the Night (2011).
The nation of Zaire is mentioned in this episode. Zaire has not existed since 1997, it is now the Democratic Republic of the Congo.
Nobody would ever use a lighter to heat a glass of cognac.
The glasses are that shape so they can be held like a bowl and the heat of the hand warms the drink, a lighter on a small area would do nothing good; but it could easily shatter the crystal glass.
While observing La Grenouille's plane, McGee states takeoff time as 24:00 (twenty-four hundred). There is no 24 o'clock, it's midnight and that's 00:00.
In this episode, the character Rene/La Grenouille states that the Cognac "L'Esprit de Courvoisier" was first drunk by Napoleon at his coronation in 1802. Napoleon Bonaparte's coronation was in 1804.
Abby incorrectly calls the computer desktop wallpaper that she and McGee are looking at a screen saver.