Picking Targets: This should be a given but I've noticed a lot of shooters picking targets that look fun and interesting (Zombies, bad guys, terrorists, etc) but are hard to see. I see this more at public indoor ranges instead of private ranges.
If you have black sights on your handgun and pick a black target don't be surprised if you have a hard time picking up the sights. This is especially true for small CCW guns that often have sights designed more for concealability instead of accuracy.
White sights against a white target are also hard to pick up and a lot of times you'll get glare on white targets at an outdoor range. Match your targets to your gun for the most productive practice.
I bet the middle aged and older shooters get what I'm saying.
Now don't get me wrong. I don't believe that everything should be absolutely perfect in order to shoot. Sometimes it's better to train when visibility is bad, it's hot/cold and noisy. It's just that for most people shooting is an expensive sport/hobby and if you're going to get the most from your range time the gray/black zombie target may not be the easiest to see. This is especially true at indoor ranges as the lighting may be a bit dim.
New shooters may need every edge they can get in order to get the most out of infrequent range time. Sometimes it's a trade off in picking a fun and motivating target against something that's kind of blah that's easier to see with the handgun that you're using.