Quite a few, but I was admittedly taking the scenic route. No intention of plowing through it for speed.
This was always part of my problem. I couldn't rest until I'd unlocked all of the easter eggs, completed all side-quests, etc. etc.
There are still probably more hidden Easter eggs strewn about. Many of those things require some kind of guide or luck to find. The completed trophy/achievement list does represent all the important stuff though.
The Welsh is the weirdest language on Earth, but I think it sounds pretty. I'm not sure if it's possible for a mature real world human couple to maintain the level of passion that Gomez and Morticia have but hypothetically, if I married a Welsh speaker, that might be my equivalent to Gomez and French.