weapons:
shotgun - can be gotten from the "donate blood for weapons" machine; also commonly dropped by enemies
crowbar - the spawn lol?
"speaking gun"/revolver - found in the library backdoor, where someone is guarding it due to a brood infestation. shoot the door and break it then go down
crossbow - found in the catacombs, top floor

can of beans locations:
building that gives you bad luck, on the counter
willow's building, on the counter
lenny/the radio guy gives you a can after you give him the toy
after killing the priests in the catacombs, go to one of the sheds near scarfolk museum and go inside the door, the guy who was in the cage in the catacombs is free and gives you 3 cans
in the party of day and night, theres a can in one of the wardrobes
near the library, theres a can in the street
near sally sandals

crow locations:
on top of a wall near the library
near the entrance of the blood4weapon machine
near the entrance of citizen security poster
killing all crows and then beating the brood king will result in the "crow ending"

important locations:
the catacombs - shed near church graveyard
the party of day and night - one of the sheds near scarfolk museum, one of them has a door inside
sewer entrance - that locked door that has "beware of dog" sign and a newspaper

quests:
lenny guy/radio guy - go to the woodshop near where you spawn and get the toy then give it to him (1 can)
muffins for 3000 cans a pop - go to cafe baltic and get the gun, you'll also get a fake gun; giving her the fake or the real one doesn't matter (crossbow bolts)
person with dementia - go to the door on your right and pick up their diary, then give it back to them (nothing)
church guy - kill the souvenir shop daughter and owner then come back; go to the catacombs and pick up sewer key 1, you can exit by going up one of the stairs and going inside of a hole and pressing E
fein, fein, fein fein fein!!! (child who robbed the chemist) - you can kill the "fiend" to spare yourself from being raided by the council; sparing the "fiend" and killing the council outside will cause a riot but in return, you can go inside the scarfolk museum without being shot, then go to sally sandals, near her is 1 bean can (1 can)

extra easter eggs:
giving the muffin lady the gun allows her to kill the chemist in the medical shop