While I was reading Lingua Latina per se Illustrata - Familia Romana, I noted something: the vocabulary list has ĕius but pēius, is that by accident? Also I noted meī as mēī in line 92 of chapter 25, but that one must be a typo.
Note that all other words have vowels noted long before /jj/ in the book, even though that's the length of the i (not of the vowel), as in māius.