Modern clothing and style

I didn't pay much attention when I was watching the trailer but now that I think about it, the clothing and hairstyles are very modern. The girls should've had big, permed hairstyles and the suits that Harry wore should've been heavily shoulder padded and oversized....

Steven had both a perm and a mullet. Pretty 1980s

Chen I Chung had feathery Farrah Fawcett hair. Pretty much late 1970s, early 80s. His girlfriend did too.

A few of the background people look time appropriate but many of the main characters didn't.

No two persons ever watch the same movie.