The level of foam in Tony's beer glass gets thicker and thinner between shots.
Pax River NAS is not used for Naval Aviator Flight Training. Flight training is done primarily at Pensacola NAS.
DiNozzo senior says he has been given an open-ended first-class flight to Monte Carlo. Monte Carlo has no airport, the nearest is Nice, in France.
Tony DiNozzo Snr. says that Prince Omar ibn Alwaan is called "Al" by his friends. "Ibn," which is not capitalized as part of a name, means "son of," making the prince's name, translated into English, "Omar, son of Alwaan." Therefore, "Al" is a subunit of his father's name, not his. While his father might well use "Al" as a nickname, he wouldn't. It would be like Gibbs, whose father's personal name is "Jackson," going by "Jack."
The royal family of Saudi Arabia is the House of Al Saud; their surname is "Al Saud." The phrase the show uses like it is a family name ("ibn Alwaan") is not a family name, but a patronymic. It means "son of Alwaan," and only the young men's father, Omar, would use it because he is the only character who is actually the son of Alwaan. His sons would both be "ibn Omar."