Technology with people clueless how to use it is useless.
Right now Instant Replay can show you a lot of stuff, including, if there is a late hit to a player (Especially QB), yet they don't use it to see if it's really a late hit.
Want to attempt to fix these issues, then..
1. Get young, extremly knowledgeable,
and trained men (Woman?) that want to be refs, and yes (Sorry NFL), pay them top buck to be NFL Refs from your insane Profits each year.
2. Have someone in the Booth trained to know the rules, who proves to be pretty accurate when looking at an instant replay (Refs on the field can still be the ones to review, but the ref in the booth can also back them up in what happened with their view)
3. Make sure they all understand mistakes can not happen, if a Ref or Ref crew make a mistake, it goes on their record, if it's a huge mistake that cost a game, they get money deducted along with the recorded mistake. (Teams can send a challenge to NFL, if they forget to reprimand that Ref)
4. At end of season, if any Ref or Refs made way too many mistakes, they are either sent back into training or let go...depending on if they went through the training protocol a few times already, yet still make too many mistakes.
If you pay them well, but make sure they are reminded their job security last as long as they do a good enough job, I have a feeling few mistakes will occur week to week.
In the NFL, if you're a player, and making mistakes, you are gone sooner rather then later. If you're a HC, or other type of coach, but make too many mistakes, your soon to be gone...Why do Refs continue to mess up, but continue to have a job?