For many years I have been watching basketball referees call fouls that I believe should not be called. For this year I hadn't thought about those much until I was watching part of a game the other day.
What I saw was a series of fouls called when a dribbler was bumped by a defender that was not moving in any way to pass, shoot or any action leading to a game changing play. In fact, none of the cases was the ball handler doing anything but changing his own location. IMO, this kind of foul should never be called because it doesn't actually interrupt significant play. Since my days of playing I have always been an advocate that there should be little to no fouls called when the only thing that actually happens is the interruption of the game by the refs.
Now, having told that side of the story, there is another side. There are times that there should be calls, when they are not, but I do understand how hard it is for refs to differentiate between calls that should be important and those that have nothing to do with the flow of the game. I spent some time as a ref too. Training, which I doubt is done all that much for refs should be done because unnecessary foul calling just irritates fans and opposing coaches plus it lengthens games.
I will now point out that other side of those calls too. That's the non calls for bumps when there should be. E.G., in one game where I observed several of those I mentioned above, I saw two instances, one where an offensive player went up for his shot and the defender bumped him in almost the exact same way as I described above. In the other the player was making a pass. In both cases I believe a foul should have been called and wasn't. In the case of the shooter, the shot went in and the other it did did effect the pass. If one is called when no pertinent action is happening in the game it should have been called when there was.
As, I said I know it is very hard for refs to make correct calls all the time, but training in off season EVERY YEAR should help with those.