Just wondering when a movie comes out on a regular 1-disc version, 2-disc se and then Blu-Ray. What extras does the Blu-Ray usually have? For example Flyboys came out on regular dvd in 2 versions...regular and 2-disc SE. Does the Blu-Ray have the extras of the SE 2-disc version? I know its different with each release. But, is their a norm of what extras are usually on Blu-Ray releases? Thanks!