Chosen answer:There are a number of reasons actors are sometimes unlisted in the credits. If it's a surprise cameo appearance, then the name is withheld to keep that information from leaking out before the movie is released. Also, some actors appear in another actor's movie as a favor because they are friends. They may receive only a scale wage or even nothing at all. Being listed in the credits would involve more contractual negotiations, different salary, affect the film's marketing, etc. Being unlisted simplifies everything.
Chosen answer: There are a number of reasons actors are sometimes unlisted in the credits. If it's a surprise cameo appearance, then the name is withheld to keep that information from leaking out before the movie is released. Also, some actors appear in another actor's movie as a favor because they are friends. They may receive only a scale wage or even nothing at all. Being listed in the credits would involve more contractual negotiations, different salary, affect the film's marketing, etc. Being unlisted simplifies everything.
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