Please use this thread as a rolling debate for what you see as logical failings within attempts at coherent world building.
I have a couple that have been bothering me recently:
1: In Harry Potter (I know, I know, read another book), we often see magic being used to heal injuries, at least injuries caused by magic, but in a world where people can repair inanimate objects with magic and do things like change their appearance with magic, it stands to reason that some level of healing of typical injuries is possible. To follow this through - are there wizards and witches with disabilities? I don’t recall any in the series. Is this because they are “healed” of any issues? In a similar vein, we are repeatedly shown that proper enunciation and fine motor skills are needed to say spells and move a wand to create a desired spell - what does this mean for people who have speech impairment or conditions that mean they cannot use a wand? Or do these people not exist?
2: In Bing Bunny, what’s the deal with Flop? He’s presumably not Bing’s dad, but is does at least seem to be his carer. But if he’s an adult, why is their world sized for “children” like Bing, while Flop is half his size? And why does he appear to be a toy animal rather than a real animal like Bing is?