I may be stupid for looking for any sort of logic in a zombie show but, it drives me crazy that the severed zombie heads keep growling and moaning... Pretty sure you need lungs for that.
That's no mechanical bull! That's Rodney, the after-hours janitor, just lying under the saddle. He pretty much does it every Ladies Night.
That's the only way he'll ever be between those legs. Unless he's a millionaire I guess. Or has a heart of gold.