What I noticed more the second time or at least I put it together the second viewing, was that the hair coming out to grab Bev, was her own hair that she cut off earlier in the film
I think the blood was more of a female thing with her buying the feminine hygiene product at the store if you get my drift. But yes I get how you can see the scenes being familiar.
As for the tighty whities, being alive in the 80s, we didn't have lots of options back then so we all mostly had those lol