R.A. CATON: Re: "the BluRay had fewer extras than the DVD!" There are many instances where a set of Blu-ray with DVD come with less or no extras on the Blu-ray disc. Firstly, they may have used Highest possible bit-rates on the Blu-ray, and had no space available for all.. OR, that the Extras that were ONLY AVAILABLE in STANDARD DEFINITION were deemed to be BETTER LEFT to the DVD disc included with the set- because as rule, STD.DEF/Low Bit-rate material looks awful when placed upon a Blu-ray Disc! This would "look" softer, less sharp etc..but on the DVD (played on your Upscaling Blu-ray player, they WOULD LOOK much crisper,sharper and film-like- often razor-sharp as IF High Definition! Out of 1700+ Blu-rays in my collection, I can verfiy the majority of extras shot in Std. Def but included as is (ported over from a DVD release) look pretty poor at BEST! But view the DVD same extras on the same player..they will look crisper and more 'hi-def' like... Obviously, Std.Def (unremastered) will always LOOK BETTER on a DVD - the act of placing the material directly onto a Blu-ray doesn't make it BETTER!! Only if/when they remaster that material and use Higher Bit rates...will std. def extras look as good or better when placed on a Blu-ray disc..
Of course, any EXTRAS that were shot in HD (eg. made in the 2000s onwards) which are placed on a Blu-ray will look just fine/great! But many extras were made decades earlier..and if left as is (ported over) from an earlier DVD release, it will NOT look "good" on a Blu-ray at the typical bitrates used!
Hope this gives you some CLARITY as to WHY some of the EXTRAS are left off the Blu-ray BUT deliberately placed on the DVD that's included in the set.. I appreciate it IS less convenient having to switch discs- but the Qulaity will appear BETTER visually..and you're sprared the ATTROCIOUS RESULTS that can often be the case on a Blu-ray where the bit-rate count is at so low a reading it can give you headache trying to watch them!