The original Clash of the Titans film was released in 1981. The remake of 2010 is about to be released. There are vast differences in the styles - acting, special effects, storyline and even in the trailers.
original trailer of 1981 film
'remix' of the 1981 film using today's style
trailer for 2010 remake
Given today's technology, films with the old effects are now nearly unwatchable.
Even Ray Harryhausen's Jason and the Argonauts of 1963 could do with a remake