Geo - You are correct. The 3rd OS goal counted after the review, making it 7-3. But just before the Rangers scored their 8th goal - I believe it was actually just moments before - OS rang another one off the iron. No goal light went on, the Rangers score #8 very soon after. They go to center ice. The OS goal is reviewed and declared no goal, so the Ranger goal stands.
The Rogers crew later show an overhead of the that OS goal that didn't get counted, but it looked identical to the Attack's 3rd goal - which was clearly in. So I was thinking they got mixed up and showed the 3rd goal on the replay - not the (apparently) phantom 4th goal.
I could just simply be in LA LA Land, in which case you can just ignore my post - LOL.