I've been told Law & Order has things cut that are actually necessary for a viewer to understand the plot.
I wouldn't be surprised. There was an episode of "Three's Company" in which a guy invited Janet to a party and told her to bring a date, so she brought Jack. Before the party started, there was a scene where the guy was talking to a gorgeous blonde, and the viewing audience eventually learned that she was his sister Nancy. When Jack and Janet arrived, the guy started to introduce them to Nancy, but he was interrupted before he could say the word "sister." So when Nancy hit on Jack, he was very uncomfortable, because he didn't realize that she was the guy's sister. He thought that she was his girlfriend.
In syndication, the conversation between the guy and Nancy was cut out, so the viewing audience had no idea that they were brother and sister. So when Nancy hit on Jack, and Jack got uncomfortable, and the studio audience laughed and laughed, the viewing audience had no idea what was so funny.
Now I'm wondering what other funny stuff from "The Big Bang Theory" I missed.