Ever wondered about... uhhhhh... Michael Jackson? Yeah. Yeah you did. Yeah. Yeah you did. Yeah. Yeah you (Note: this strategy can be instantly fucked up by Michael Jackson using either Spread Bomb or his other move that targets everyone two times in a row, so don't get too shocked if you still get a bit fucked up).
A text version of the strategy used in the video can be found here:
Use Freddy (with Swag equipped, which you can do when the menu is opened in the DeLorean cutscene.) and 80's B.B. for dealing damage to Michael Jackson with the basic Scream attack. The only expection to this is if there are two dead party members, which in that case have them spam Cakes.
Use 90's B.B. and T. Foxy to either guard (if everyone in the party is alive and both 90's B.B. and T. Foxy have more than a thousand LP remaining), use a Large Pizza on themselves (if one of their LP has reached below or close to being below a thousand), or use a Cake (if anyone in the party dies).
When using Explode with 80's B.B. make sure to also use a Cake with Freddy on the same turn, this will ensure that 80's B.B. will be pretty much instantly revived without having to use up a turn.
In the Actors tab of Fuckboy's 1, there are multiple characters that lack a unique character and face graphic (Mangle is the only exception however, as she has a unique character and face graphic).
The likely reason for these actors being here is to make Fuckboy's 1 save files work properly in Fuckboy's 2 so the player can access Afterstory without using the option in the menu.