Plot hole: A core plot point (lifted by the comics) is that Venom needs phenethylamine, and the only way to get it is from brains and from chocolate. Let's just go with it and forget the fact that phenethylamine can be legally purchased as dietary supplement, which would solve every problem. So, Venom gets incredibly angry because Mrs. Chen's shop ran out of chocolates, and *therefore* they need to go raid a chicken plant to eat some chicken brain. Uh, Venom lives in San Francisco. Chocolate is sold everywhere. If Mrs. Chen ran out of it, there are hundreds of stores and vending machines that have it in abundance. The escalation does not make sense.
Continuity mistake: At the beginning of the "Let's Call The Whole Thing Off" scene, Eddie already poured the orange juice and put it down before Venom messes with the radio and fridge. We see then symbiote's tentacle pass in front of Eddie's hand, which is suspended in mid-air still pouring. Then we cut back to the original angle and Hardy is about to drink from the glass, the orange juice carton well set on the table. (00:23:05)
Other mistake: At the beginning of the movie, Shriek reads an article mentioning that Cletus' story is "coming to an end", and Eddie is credited with uncovering "what the FBI and police could not " That doesn't fit with Eddie supposedly down on his luck and badly needing a scoop; and in fact the tagline is the same that will appear in printed and audio news later when Eddie does rise to fame again by discovering the bodies. Also, the article talks about Eddie Brock, but somehow is WRITTEN BY Eddie Brock.
Other mistake: Venom and Eddie are having a domestic dispute. Items rain off the window in front of a homeless person. The other passers-by change between shots. Not only that; in the second shot there's one extra who turns around acting startled by the man's shout. Does not really make sense; heavy objects just crashed down a few feet from him, anyone would have been startled by that first and foremost. Wrong reaction time/ direction of the extras. (00:32:45)
Continuity mistake: Carnage pins against the wall a prison warden who begs him to spare him. He looks straight ahead and the POV shot displays Carnage's face directly in front of him, but in the side view Carnage's splotchy eyes are in front of the chest of the guy and the tongue has to go up a lot to plunge inside the victim 's oesophagus. (00:38:15)