>>718779902
I don't remember all of them on top of my head but...
- If you go get the Grenade Launcher before triggering the Shotgun Room Trap, Barry will be there and he will show you Forest's corpse. But if you do this he will no longer help you with the Shotgun Room trap, so you will need the broken Shotgun.
- If you did get help from Barry with the Shotgun Room, then when you enter the main hall from the second floor he will give you Acid Rounds and deliver his iconic line "it's really powerful especially against living things". This doesn't happen if you go for Grenade Launcher first.
- Can't remember what triggers this but there's a hidden cutscene of Barry talking with Wesker in the Guardhouse. You can overhear him talking from behind one of the dormitory doors
- If you don't wait for him to drop the rope after the Snake Boss Fight, he will die in the first laboratory save room and i think if you loot his body you will find a picture of his family.
- If you wait for the rope after the Snake Boss Fight he will survive and you will get the standard good ending
This is just for Jill's playthrough.
In the original you could sequence break stuff and even change the order you did things.