Since I've had to read the Tokyopop version recently for my comparison reviews, I've spotted quite a few mistakes they did.
For actual translations errors, as I've mentioned in the first 2 reviews, Mew Mint's animal is mistranslated as Ultramarine Lorikeet (it's Blue Lorikeet). There's also all of the weapon names that they couldn't decide on.
As for printing errors, in the character bios of volume 3, they mixed up Purin and Zakuro. In volume 7, they messed up Aoyama's bio. So it accidentally says "Ichigo's a cute and super nice boyfriend." XD
And, while it wasn't in my volume since I have the first edition printing, in the 2nd printings of volume 6, a lot of copies have a few pages from a different manga.