At the end of MI2, "Chuckie" looks at the screen and his eyes flash, implying he's still really LeChuck. Additionally, there's scene of Elaine speculating about

At the end of MI2, "Chuckie" looks at the screen and his eyes flash, implying he's still really LeChuck. Additionally, there's scene of Elaine speculating about a voodoo curse. Ron Gilbert never "sequel-proofed" the game; the route that MI3 takes was deliberately left open.