Zombi 3 (1988)
Surviving not-infected character is shot by military people.
Surviving characters have to battle their way out of a closed down zone while fighting both the infected people and military men dressed in white protective suit not letting anyone leave the area.
Zombie baby bursting out of a pregnant woman's belly.
In Zombi 3 they burn the body of an infested man as they do in the return of the living dead. This causes the dead to wake and make people in to zombies. Several other references are included as well.
the flying head that bites someone to death
The 'animated zombie head in a freezer box' gag is reused in Dawn of the Dead (2004).
Part of a list of movies that the video store is out of
complained about titles name
Snob refers to it as the real Zombie 3.
poster visible in the video store's office, Hope also mentions it in dialogue