Sir chambers a round in his shotgun as Jerry drives the van toward him. But he had already chambered a round while in the house. And since no round was ejected while chambering the round the while on the porch the gun was not chambered, indicating a continuity error.
Despite the movie's subtitle, ticks aren't insects. They're arachnids, more closely related to spiders and scorpions.
When Dr. Kates anatomizes the Tick, an audio recorder appears at the left top of the picture.
Just before LP Tank explodes outside of cabin (at end of film), the pyrotechnician's gloved hand can been seen on the right side of the screen lighting the fire on the ground with a torch.