McDonald's Happy Meal web site confirms that the October 2015 kids' meal theme will be based on the current film Hotel Transylvania 2 (not The Nightmare Before Christmas, which was released back in in 1993).
There are differences in the shell textures of oysters and clams. The shell of a clam is smooth and shiny while an oyster has a rough outer shell. Both the organisms take in water through the shells but the filtering procedure is different. Oysters produce pearls which are in much demand but clams do not.
Clams: Many people serve clams along with oysters. In this case, 1/3 of the amount is needed for clams. For example, if a party is being planned for 100 people with oysters and clams for appetizers, we would recommend 300 oysters and 100 clams. Shrimp: As appetizers, figure 1/4 pound per person.