Continuity mistake: The chain and collar vanishes from Mailer's neck as he runs into the mansion. (01:33:45 - 01:35:20)
Suggested correction: It doesn't disappear; it is just hard to see. The chain is attached to the actor's back, quite securely, likely for the actor's safety. It is there, though, and can be seen in some shots.
Plot hole: When someone is in a coma for 28 days, the hospital would have AT LEAST have catheterized said person, however when Jim wakes up in the hospital he is not attached to anything but an IV.
Suggested correction: What happened when Jim was admitted is never revealed. Being that there is nothing to show what happened when he was admitted its impossible to say certain procedures would have been followed or more simply the hospital might have not undertaken them. More importantly we don't know when the virus hit certain areas. In addition Jim was taken in around the time the virus was first starting to spread and hospitals would be the most likely place someone infected would be taken to so many working or staying there would have been the first to have been infected. With that scenario the staff at the hospital might have neglected some of their patients because of how quickly the virus spread.
If the hospitals would have been some of the first infection sites, why would Jim have survived the entire 28 days? I doubt someone was refilling his IV on a regular schedule if the patients are becoming violent animals, which would suggest he would have died of dehydration before starvation would have gotten to him. Also, why would those infected ignore Jim while he was comatose? Would it not be 'sporting'? Given how instinctual they seem to become I don't see how comatose would be any different from intoxicated or deeply asleep. Did all of those sorts avoid infection as well?
Answering the question in order... 1. It isn't known how long Jim has been in hospital. It may have only been a few days. 2. Maybe they didn't know he was there, or alive. It isn't shown how the infected react to an unconscious person. Perhaps they ignore them. 3. The infected have no concept of 'sporting'. 4. Possibly. They just don't feature in this story.
Other mistake: When Jim, Selena, Frank and his daughter enter the supermarket, you can notice all the fresh produce (apples, carrots etc) looking fresh. This virus has been going on for a few days now, and supermarkets get their fresh produce out immediately. After 10 days or so, give or take, the fresh produce shouldn't be looking this fresh. (00:46:00)
Suggested correction: You're mistaken. I've just watched this scene (and rewound it a couple of times to check). All of the produce, apart from the one tray of "irradiated" green apples, is rotting and mouldy.
