I wonder if this has ever happened before. If you're a fan of Law & Order: SVU, you probably had no idea there were two different endings to last week's episode. 

(Minor spoiler ahead.) 

On the NBC version, seen by those of us in Canada, a detective comes in to tell Captain Benson that her old partner, Elliott Stabler, is in the hospital.

But in the Peacock version (not available in Canada) that scene never happened. Instead, one of the newcomers to the squad, who spent the episode trying to prove himself to his new Captain, was seen taking a secret meeting with her superior, which would seem to be a key plot point.

Viewers who watched on the main network never saw this.

The likely reason for the difference is that the network storyline continued in the following show, "Law & Order: Organized Crime." So it was seamless for viewers, but they never got to see the alternate ending unless they watched online.

You can see both side by side here. 

Apparently, this isn't the first time. I had no idea that "Organized Crime" also has alternate versions - one with swearing on Peacock and the same scenes sanitized for the network. You can sample both of those here. 

I wonder if this is happening with other shows on NBC.