Micheal & Lil' Liam Mulvey were not in the scenes where the Nerd would curse for obvious reasons.
Two actors play the role of Michael Myers in this review, because both of the Nerd's encounters were filmed in separate locations on separate occasions. The first encounter was filmed in James Rolfe's basement, with Mike Matei donning the mask. The second encounter is in the living room of the Mulvey house, with Liam Mulvey playing him.
The credits officially call Michael Myers "The Shape" a nod to Halloween (1978) where in the film's script and credits Michael Myers is officially listed as.