canuck
With your reference to close games, I thought maybe my post was mis-understood. What I was referring to was fixing the initial problem before making the ball live, in a close game or a blow out. In no circumstance do you want to knowingly make the ball live with the wrong number of players on the court (and before you jump in with exceptions folks, I know that 4 is the right number when you run out of subs

).
Once the ball becomes live, your hands are kind of tied, although I also agree with "not noticing" the player that returns to the court in a 40 point blowout. BUt if you screwed up and made it live with only 4 on the ocurt in a close game, and now the 5th runs on with the ball in play, gotta call it.