It was a joke how he described it. I'm not going to make a big deal about his use of the word "films." Did he see others, like the Nix film? Who knows? But it's not some sinister slip of the tongue with "films" like some of the crazies out there may make it out to be (e.g. "OMG! There's another film out there that we're still waiting to see showing Dick and Allen behind the wall giving Ruby directions to fire the shots! OMG!")
But I've always believed that, even at this point, with Oswald dead, the official message is starting at this point. Just like Ken O'Donnell saw some stuff, mere feet away from the shots, but was told by the FBI that he was wrong, that that isn't what he saw. And he quietly just didn't talk about it any more.
Good old Dan was young and ambitious, just like a lot of other TV "performers." I call them that because that's what they all are - performers. The newspaper people are the real reporters, though they, too, blew the assassination when they were fed the official line. Only the foreign press knew the truth and said as much.
Anyway, old Dan had just started in NY in '62 on a trial period, so he knew he had a good thing going and wasn't going to rock the boat. Just say what others are saying in the room - "...his head falls forward" etc. etc.