why do old movies have credits in the beginning
Opening credits Up until the 1970s, closing credits for films usually listed only a reprise of the cast members with their roles identified, or even simply just said "The End," requiring opening credits to normally contain the details. For instance, the title sequence of the 1968 film Oliver! runs for about three-and-a-half minutes, and while not listing the complete cast, does list nearly all of its technical credits at the beginning of the film, all set against a background of what appear to be, but in fact are not, authentic 19th-century engravings of typical London life. The only credit at film's end is a listing of most of the cast, including cast members not listed at the beginning. These are set against a replay of some of the "'Consider Yourself" sequence.
Sound film The primary steps in the commercialization of sound cinema were taken in the mid- to late 1920s. At first, the sound films which included synchronized dialogue, known as "talking pictures", or "talkies", were exclusively shorts. The earliest feature-length movies with recorded sound included only music and effects. The first feature film originally presented as a talkie was The Jazz Singer, released in October 1927. A major hit, it was made with Vitaphone, which was at the time the leading brand of sound-on-disc technology. Sound-on-film, however, would soon become the standard for talking pictures.