Continuity mistake: The giant (and obviously fake) spider is beside Marsha, crawling toward her extended right hand when Illya tells her to freeze. But when he clobbers the foam-rubber menace in the next shot, he attacks the grass behind her. And her right hand, stretched out on the grass when he said "Freeze," has instantaneously moved to her lap between takes. (00:29:05)
Factual error: When Baby the gorilla walks around, he consistently does so bipedally, like a human. While gorillas can walk that way over short distances when carrying food or when defending themselves, they more commonly move quadrapedally on their knuckles.