Like scribal errors, type-setting errors, etc.? So that the commonly available PG PDF’s (with the Latin translation) are not reliable? What about TLG? Does it have everything (or almost most of) in PG?
I take you mean Migne, not Parental Guidance. I’ve never used it much, but did find occasional typos in the original TLG. I think it got better as they adopted better editions for some of the material. The TLG doesn’t include the Latin but has most if not all of the Migne texts. It’s as reliable (or as unreliable) as any text.