Rex explains to Zeb and Ezra about clankers, but they'd already heard him use that term previously. Ezra even seems unfamiliar with ray shields, which were still shown to be in common use in the Rebels era.
After securing a former Separatist shuttle for use as the Phantom II, Kanan tells Sabine that it will need a new paint job. Kanan is blind and would have no idea what the paint job it already had looked like. For all he knew, it was already an artistic masterpiece.