Seemless edits.
The one thing my old lecturer would drum into us was "the 180 degree rule" where you must only film from one side of the subject otherwise it looks like they've turned around or swapped places.
Another good thing is to get someone else to edit your shots. It's easy to become attached to something that doesn't work because it took you so long to film it.
Love the dog walking film. Looked like a Beautiful day.