The new stuff contained in the updates

One Night at Kermert's:
-Some Updated Textures
-Fart Power Meter
-You now have to press SPACE to fart
(Not much was changed in this game)

One Night at Kermert's Christmas Edition:
-Some Updated Textures
-Updated Office Design and Music
-Snowball Throwing Animation
-Limited Number of Snowballs to Throw
-Sprite Cranberry is now an Enemy and not an Office Prop
-Krampus Kermert has a New Mechanic and Jumpscare

One Night at Kermert's 2:
-Some Updated Textures
-Shock and Gas Power Meters
-New Turd Ferguson Jumpscare
-Completely Revamped W. Blue Kermert (New Design, Mechanic, and Jumpscare)
-Updated End Minigame
-LuigiAiden Replaced in End Minigame(play the game yourself to find out who it is)