He has bendable knees and elbows for easier posing. Regular SB's Jumpscare will be a single frame, just sliding in. Cursed SB's Jumpscare will have him coming from bottom left to middle of screen, also having his neck/head turn a lot.
Sorry if it's confusing, Basically: SB is always on your cameras. The only way to tell if SB is real SB or cursed SB (cursed SB can mimic real SB) is by the plush's eyes. If the plush starts looking at you, that means real SB has been replaced with cursed SB and you need to shock him. Shocking real SB will cause him to jumpscare you. Not Shocking cursed SB in time will cause HIM to jumpscare you instead.