There are no opening credits in the film except for the title card, making this the third consecutive Star Trek film that does not list its cast at the beginning.
One character is credited as Cupcake. This was the name Kirk called him during the bar scene in the previous film.
One character is credited as "Enterprise Redshirt". In another role, an actor is listed as "Gary 7", which was the name of a character in the original series episode Star Trek: Assignment: Earth (1968)