During the intro sequence, there is a magic circle with the text "OBEISSEZ A VOS SUPERIEURS ET LEUR SOYE SOUMIS PARCE QU'ILS Y PRENNENT GARDE" around it (only with the "E"s replaced by Greek capital sigmas), which looks like it might be Latin or Greek, but it is actually French, though with a letter missing. Once proper accents are added, it translates as "Obey your superiors and be subjected to them, because they take guard there".
The tank that the main characters ride in is a Type 74.
The thing that runs across the screen during the second season eye-catcher is Junpei in a rabbit suit.