While rewatching 1.15 Inner Child today, I heard a quiet popping noise during the show. I recognized this sound from the sneak peak released before 4/7. If you go on Hulu, one occurs at 30:01, and the other at 40:29. They're identical, and I heard them on my television too, so I don't think it's Hulu.
Any explanation or ideas?
The 30:01 pop occurs when Walter is dancing, and the 40:29 one occurs when Olivia is talking to the child.