If you can, find the non-widescreen DVD version.

They left the most important, emotional scene of the film (along with the song they used a "pop" version of for the ending credits anyway) out of the theatrical cut of the film.

It's the scene where Scrooger gets dumped, and there's a beautiful duet of Michael Caine singing along with his ex-fiance as his heart breaks and he starts to become human.

Without that scene, he suddenly goes from being the man at the beginning of the film to the much friendlier Scrooge with the Giant.