Corrected entry: In one episode (can't remember which, sorry), Dinosso and McGee are having an argument, and Dinosso turns to McGee and calls him "Shaun".
Corrected entry: Gibbs will break a mobile phone (generally in the office), and be given a brand new one by Tony. No one ever notes the new number or passes it on to those who Need to Know it, but Gibbs can still be called by anyone, especially from their speed dial.
Correction: It can be safely assumed that the number is distributed off camera. It's not necessary to show them giving out a new number. Besides, it's also possible to assign and activate the same number to more than one phone.
Correction: Because of the lack of specificity, this can't be considered a valid mistake. There's no way to verify or refute the mistake. If you can't remember the episode, let alone the scene, how can anyone be sure you remembered DiNozzo called him "Sean" (the actor's name) or just misheard something?
Bishop73