All taken from The Essential Wonder Woman Encyclopedia.
1. Abu-Gita, an ape queen from Gorilla City, once tried to invade Themyscira, home of the Amazons, but Wonder Woman's use of the Lasso of Truth on her revealed that her faith in her gods was based on lies.
2. Etta Candy, Wonder Woman's chubby sidekick, has a father named Hard , a mother named Sugar, and a sister named Mint.
3. Wonder Woman once fought a group of flying shark-women who attacked Paradise Island after being mutated by a scientist named Gerta Von Gunther, who later saved the day by dousing their leader, Queen Sharkeeta, with "humanizing solution" that made her submit to being imprisoned on Reform Island.
4. A villain named the Sinister Seer of Saturn once attacked Wonder Woman by sending a doll-sized replica of the heroine to Earth which then grew to gigantic size. When Wonder Woman tried to stop it, it attached her to itself magnetically and blasted off back to Saturn, where the villain put her through challenges that involved her regressing in age to become Wonder Girl and Wonder Tot.
5. Wonder Woman once kidnapped a boy and took him on a time-travel trip because he was bored in history class. They ended up getting trapped as ghosts in Nero's Rome.
6. A villain known as American Adolph tried to form a criminal empire and take over the United States, but was foiled when Wonder Woman was given a copy of his book, My War Against Society.
7. A Leprechaun named Moon O'Day, who, despite being male, was a student at the Holliday College for Women, created a typewriter that could make anything typed on it come to pass. This typewriter was acquired by a criminal known only as "The Boss", who used it to tell Wonder Woman to fly a kite around the moon.
8. Wonder Woman once fought an alien robot named Princess No. 1003, whose disappearance from her home planet prompted an invasion of Earth by its other 2,785 robot princesses.
9. There have been at least eleven different versions of Wonder Woman in all the various timelines and continuities of the past 70 years, including two different versions of the original World War II-era character, two different versions of Wonder Woman's mother Queen Hippolyta, at least two former Wonder Girls, two different characters named Artemis, and one of several versions of the villainess Circe.
10. Wonder Woman once fought an evil wizard named Strogo, who lived on the Planet of Thought, which was populated by fairy tale characters. He captured Wonder Woman as part of his scheme to obtain an element called "xium", which would power his black magic wand. When Wonder Woman shattered the xium gem, everybody on the planet turned into a toddler.
That's a tiny sampling of the bizarreness on display throughout this massive tome. If you want to be overwhelmed by decade upon decade of confusing, often tedious inanity, give it a read.