Perhaps the deleted scenes on the DVD/BD were indeed from the original elements, combined with the mono TV cut mix. I know that the Blazing Saddles releases with its deleted scenes also have them in widescreen, but with the censored TV audio. I believe that the same thing happened with The Goonies as well, they’re in widescreen but with a full mix and at least one instance of redubbed profanity. I’ve always wondered if they had some kind of widescreen master that was used to make the pan and scan (like the so-called “director’s cut” of Supergirl which has mono sound and censored dialogue characteristic of a TV version), or if it was restored picture conformed to the P&S TV cut and synched to the audio.
I’m inclined to think it was the former. The picture quality isn’t all that great for the deleted footage and has not been restored. Seems like a lot of work to go and get the original elements, edit them so they are frame accurate to the TV cut, but present them in SD with no restoration.
In the making of featurette on the Donner Cut, Michael Thau is showing Donner the “Power of Three” deleted scene. You don’t see it but they mention they would have to fix the crappy effect when they break through into the fortress. If the clip was made from the original elements, back to the negative like the rest of the footage, wouldn’t there be no effect?