As Ferguson throws a rock at the black cat during his drunken encounter with the feline in an alley, he misses. The next successive shot shows the rock hitting the cat as it scurries away.
In the opening scene, a man gets into a red car. In the close-up shots, the back door is ajar. In the wider shots (including driving) the door is shut.
What appears to be fishing line can briefly be seen holding up the bats as they attack Jill.
During one of the later scenes when the cat is terrorizing Jill you can see a crew member's hands holding onto the cat.
When Lillian goes in her bedroom with her boyfriend, you can see the reflection of the boom mic in the mirror on the wardrobe door.