[Fizzlemizz]

In the section where you have the line:

MouseLookFrame:RegisterEvent("PLAYER_ENTERING_WORLD")

Add the line:

MouseLookFrame:RegisterEvent("CINEMATIC_START")

Next, before the line:

if event == "PLAYER_ENTERING_WORLD" then

Add:

if event == "CINEMATIC_START" then
	MouseLookOn = false
	MouselookStop()
end

This hasn't been tested.