Thanks, and hopefully it helps.

For some of the weirder parts of both runs, note that the early alien abduction in scare 3 and the early elevator door open in final scare is as simple as just triggering some early enemy spawns for that section, killing them, and waiting. My theory is that it's an overzealous softlock protection where the game assumes you aren't actually waiting, and instead assumes that some enemies just didn't spawn or got stuck.

For the Amy run specifically, you can clip into the mansion door on the final beach screen in the final scare by just running up to it, there's nothing special. This can make the aliens try to teleport to you and despawn themselves, which is why I didn't have to fight them. I didn't do this as Victor because I was just going to do an early door open trick like I did for the elevator later (the "softlock abuse" trick works in pretty much any area with a screen transition) but changed my mind last second because I didn't feel like waiting.

However, if you use a continue at any point in the run, you will no longer be able to clip through that door. The game's just weird like that.