The nation of Zaire is mentioned in this episode. Zaire has not existed since 1997, it is now the Democratic Republic of the Congo.
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.
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.
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.