Why it is that, occasionally, well-known actors have significant roles in movies but are not listed in the credits?
Sometimes well-known actors make a cameo appearance in a movie and their name is not included in the credits to avoid spoiling the surprise or drawing too much attention to what is essentially a very minor (but often pivotal) role. Sometimes the missing credit is the result of a billing dispute: a big-name actor makes an appearance in the film and, rather than getting a minor or non-prominent credit, may prefer to take no credit at all.
