Shane
You have elucidated something we all face - after working on a project for days/weeks/months - sometimes it is unbearable to watch it all the way through yet again. Even on shows that came out great, you sometimes have to force yourself to watch it all the way through.
Nearly everything I work on is not mastered to tape, but rendered out to a DVD or other format, so watching it before rendering, and watching the rendered file, and the burned DVD is a triple whammy.
On any timeline, I check each transition and rendered effects, and use the Page Down key to check every edit point - depending upon the content, sometimes this is all - sometimes not.
A somewhat related anecdote - not really the same thing, but you got me thinking:
Journey with me back to 1995 - I was finishing an edit the night before 4th of July weekend - really wanted to go home, but the thing had to get done. I don't recall exactly what happened, but for some reason I executed an edit as assemble, instead of insert. It was only after the record heads engaged that I realized my error. I was so mad I kicked a hole in the wall.
This being the pre-digital era, the only solution was to assemble edit the first part of the master to a submaster, fix the hole created by the bad edit,then assemble edit the 2nd half of the program, then repair the soundtrack (editing on 1", we would build the soundtrack (narration, music) on a Betacam tape, then dub this to Ch.2 on the pre-striped 1" tape, then use Ch.1 for nat sound during the edit).
Thank goodness it is more difficult to make such errors in a NLE system, but I'm trying to illustrate the point of paying attention to your edits, and remembering that the longer you work on something, and the later at night it gets, you can miss things.