Each of us owe it to the game, the players, and our fellow officials to get as much right as humanly possible. If you see a significant error being made, you should step up, as professionally and courteously as possible, and let the crew know they are about to make an error, and offer the correct ruling/ball placement. Judgment errors are tricky. In a crew of 5, there are only so many eyes (10, maximum), so offering an opinion from a different (literal) viewpoint is not a bad thing. But 1) be sure you are right, and 2) be sure you had a good reason to be looking at the action in question.
If, in either case, you get major push-back, and they stick with the original ruling/placement, know that you did what you could. Soon enough, you will get assigned with other folks, and your situation may improve.
The trick is to do this without embarrassing anyone else, or coming across as the "know-it-all," or as being over-officious. When done right, such interventions are appreciated. Be a crew saver, as politely as you can.