A "meatball sub" implies the existence of a "meatball domme." I've eaten a meatball sub, but not a regular sub. I've never eaten a meatball domme, I wonder if they are more delicious than a regular domme.

The TIFFANY PROBLEM occurs when a historical novel or film contains details that seem too modern to be true but are in fact correct for the time. The name Tiffany is one such example, it dates back to at least the 12th century.