No need to apologize. We really want to hear about typos, even minor ones! I've logged this in our errata.
It will definitely help us for a second edition. But more immediately, it also helps readers of THIS book. I wrote a blog post last year about why posting all errata, no matter how minor, is important.
Great article, that's the spirit! I too want this book to be perfect, so I will keep sending feedback as I work my way through the chapters.
The fact that the errata list is so long means one thing to me: people appreciate the importance of this book enough to bother submitting their findings. No one wastes their time contributing to books they don't like or don't see any value in.
The book says that Java provides an interface with common collectors, but it doesn't say which interface it means. I think it means the class java.util.stream.Collectors, but that's a class, not an interface.