An open rant to publisher, designers, and authors of role-playing game supplements:
For the love of all things lawful good do the following:
Hire an editor. Or at least use a mechanical one. At a bare minimum use a spell checker.
Don't wrap text around images. It doesn't look cool, and it makes things hard to read.
Even if you don't have an editor, have someone with normal eyesight look at your page layout to spot weird issues.
Use full justification or use ragged right. Don't do both on the same page.
Use the same font size for the body of your text. Don't change it mid-paragraph.
When you cut and paste from one description to another, make sure you replace the item names in the description.
You don't need to have a reproduction section for every species of monster or player character race.
We don't need more world killers. The Tarrasque is open game content in the 3.x SRD, the Pathfinder SRD, and the 5th ed SRD. Don't need more like it. If anything, just add your special touch, like it can fly or can live in space.
The f-bomb shouldn't be used as a general-purpose adjective. If you are going to use it, please restrict it to the normal sexual meaning or excited utterances. Don't toss it around like copper pieces.
Speaking of copper pieces, assuming a gold piece is equal to a current US dollar is just silly. A bog standard RPG gold piece weighs 9 grams.1 That puts its value at around $360 today.
No one wants to read about coprophagia. And really, no one to play a character that has that as a major part of its racial backstory.
If you are trying to be gender neutral either use singular they or alternate between male and female pronouns, but don't use all three in the same paragraph when talking about the same thing.
Advanced space-going civilizations will not have high-tech melee weapons. And if they do they will not be katanas.
Monomolecular weapons are impossible. Stop using them
Chainsaw like swords, axes, and pole arms are silly. Stop it.
Shotguns don't have nearly the spread of shot you think they do. Consult this handy chart for the actual size.
Learn the difference between an Armored Personnel Carrier, a Tank, and a Self Propelled Gun.
Understand why multi-turret tanks went out of style in the late 20's early 30's of the 20th century.
Understand why a two-person crew of an armored fighting vehicle with a main gun is a bad idea.
Thank you.
Signed: a person who reads way too many RPG PDF files
1Most version of D&D, to include Pathfinder, put "coins" at 50 per lb. That works out to almost exactly 9 grams per coin.