Huh, thanks for letting us know! The bug you mention is really odd- I'd like to see if I can replicate it and figure out how that happened so we can get things more polished post-jam~
The selfie screen has a large "back to shop" button- did that show up on your screen? And about the cash register collectible- did it disappear from the shop screen when you collected it? I'm wondering if some kind of browser-related delay in animations could be causing unexpected behaviour.
Edit: Ah, I can see what happened with the endless collectable bug! Fortunately that's a quick fix. Not sure about the shop screen though- I think I'd need a little more info to replicate that one.