Both versions are near identical, but I think the Region 2 has player generated subtitles whereas the Region 1 contains the original subtitles on the film print. I think there may be one extra missing from the R2 set as well but I am not sure
The reverse is true - there's an R2 exclusive extra. I ended up going for the R2 because the R1's picture quality wasn't that good, owing to the fact they squeezed a pan and scan version on the same disc. Unfortunately, the player generated subtitles are sorely lacking though. eg The shot of the harbor reads 'San Pedro Harbor - last night' on the print but just 'San Pedro Harbor' on the disc.