Other areas of concern: ramen, gyoza, panko, tempura, curry rice mix, miso, dashi, salad dressing, marinades, tamago (omlete), flavored roe, fish cake, wasabi.
Not all have gluten, but may.
FYI - if you patronize a sushi bar, the chef will get to know your needs.
Also, you can get a great Japanese dining card at
Triumph Dining
Wakarimas ka...