1a. I went to see a movie. It was called "ZZZ". (Maybe you have never heard of it. Have you heard of it?) 1b. I went to see that particular movie that is called "ZZZ", and not any other movie. (Surely you've heard of it, and you know which movie I'm talking about.)
2. If the two sentences are supposed to go together, then
If two sentences are combined, would it be logical?? to put the definite article the in front for the second sentence? I think the inclusion of "the" might be better.
The dinner menu was hamburger and Pepsi Cola. The dinner was delicious.
I think putting the gives out an implicit notion that the dinner is the one served on that day.