As the Thug Zombie is on top of the lawnmower and is getting hacked to bits, his body parts don't fly off. E.g. his arms would've flow out everywhere when the blade reached his shoulders, and the same goes for his head.
Director Peter Jackson makes a cameo appearance as the Mortuary Director's Assistant when Lionel's mom is being filled with embalming fluid. Whilst the fluid gushes out of Mum, Jackson grabs the sandwich he left beside the corpse and takes a bite. Doesn't he look odd without his beard?