As far as I can tell Larian has lifted the Ranger companion from 5e directly, but they've messed up the correct creatures. The second problem is the challenge rating (CR) levels, higher numbers are better. I think CR 1/2 is meant to be the max for this level Ranger and some creatures have accidentally/temporarily been added, meaning the Ranger companion sub-class has access to creatures it shouldn't be able to access at these early levels.
The creatures available in EA:
Wolf is CR 1/4
Boar is CR 1/4
Raven is CR 0
Bear (has Black Bear stats) CR 1/2
Giant Spider CR 1
I think someone might have confused the Giant Spider (CR1) with the Giant Wolf Spider (CR 1/4). And the Raven probably should have same stats as a Blood Hawk CR 1/4 to make it useful (or even be replaced by).
Also if anyone from Larian is reading other interesting options not in-game include the Giant Frog, Giant Poisonous Snake, Giant Crab or Flying Snake.
Sources:
https://5e.tools/bestiary.htmlhttps://rpgbot.net/dnd5/characters/classes/ranger/subclasses.html