The hot plate. At many okonomiyaki shops the staff cook on a hot plate (teppan) at your table or counter. At some, you mix and cook it yourself. If you are unsure, ask the staff to cook it for you.
Eating. Cut pieces with the small spatula (kote) and eat from the plate, or ask for a plate and chopsticks. The plate stays hot, so do not touch it.
Toppings. Sauce, mayonnaise, green laver (aonori) and bonito flakes go on top. If you do not want one of them, say so before it is cooked.
Takoyaki is very hot inside. Break a ball open and let it cool for a moment before you eat it.
Takoyaki stands. Order and pay at the counter, often before you get your food. Many have standing room or a few seats only, and some take cash only.