<cough> On the range of things. Grenade launchers can launch over several hundred yards in real life. Panzerfausts were generally able to shoot twice as far as their range, but that of course was highly inaccurate, and Panzerschrecks, well.
In the 1990s, a group in germany decided to test just how accurate a schreck was, a subject of constant debate. So, they figured the best way to test it was to get a guy who actually was trained on it. So, they found an 80-something year old German veteran who had been a tank hunter in WW2. They handed him panzerschreck, 3 rounds, and pointed him at 3 T-34 cutouts 400 yards away. This aging veteran then proceeded to hit each one.