I compress or eliminate flashbacks and dreams whenever possible. Stories are often strengthened by revealing action scenes in chronological order, even when the story was written in another order that made sense at the time. I look carefully at transitions between scenes and revise anything the least bit awkward or in need of further clarification. When I notice I've given too much information to explain how a character traveled from one place to another, I cut all that out, have the character stay put. A lot of revision has to do with simplifying what was needlessly complex.
Stories change when told by a different viewpoint character and sometimes that's a good thing.
I've tweaked point of view from first to third, changed the central character from an adult to a child, and found a better story and a market because of that. I've had success keeping my characters essentially the same but changing the scenarios, turning a Halloween story into a Christmas one, for example. This required revising the entire story several times to make sure everything made sense and the holiday theme was more than a hasty giftwrap. I've even thrown away whole stories, keeping only the title. It's embarrassing not to recognize when I've used stereotypical situations, but relying on the first trope that comes to mind can make the difference between an ordinary story and one that captures the imagination.