I bought two of these "In-Laws Double Feature" DVDs from two different vendors [one Amazon and a different one too] and both discs froze during the scene [1979 version] at the dentist office. They froze in exactly the same place and would not play after that point in the film. It must be a manufacturing issue. Trust me, I tried everything to get them to play. No joy.
I really wanted the 1979 film, as I already own the 2003 remake.
I ended up buying the Criterion version from Amazon, and it played all the way through. It costs a lot. I ended up paying thirty dollars for the Criterion remastered 1979 version, and ten bucks each for the two defective discs and the 2003 one I already bought cost me another ten bucks, --- sooooo I have over sixty bucks invested in these movies.
The Criterion remaster works fine, but costs a lot more.
I am giving this double-feature version one star.
The 1997 Criterion version, although relatively expensive, was a good experience.