Did anyone check the credits to see if there was any mention of Ceasars Entertainment Studio being a filming location? It sure looks like they used at least some remnants of the syndicated version's set, with the large screen at center stage replacing the old "doorway" that Regis would use, although those "rails" going up the steps on the sides of the screen look new to me. I don't recall seeing those in the last few years of Millionaire.
So, just like the Wheel of Fortune episode they did recently, they got everything right in terms of the music and sound effects of the appropriate eras, but visually is where things fell flat. I didn't expect the question chyron to be 100% accurate with the original, but I at least expected it to use the signature font it had been using up until the penultimate season of the syndicated version. That, and the "shapes" look closer to the ones used in the Clock era or the "Shuffle" era than the original primetime (which were black, not blue), and the font almost looks like the MS Office default font.