Jbark. I like your critique. Terrible narrative faux pas in my opinion. It really annoys me when things like this happen. Especially in big budget productions. When i watched Interstellar and the guys truck got a flat tyre and then the truck was ok again. Ruined the whole film for me and pretty much bummed me out for the following months. Even years later if anyone ever mentioned that they had watched Interstellar it would put me into a complete headspin and i would revisit certain factual errors that occurred in the film and get then very emotionally charged with whoever try to imbue it with any kind of merit.

So. In the spirit of the Nexus of offering succour to those in need, succour is what you will recieve......

In relation to the carving the complex symbols in her own back situation i will try to offer a solution. They were locked up for a long time so perhaps she could have wedged a sharp object into a nook or a cranny and manouvered her back  against the writing implement while another  prisoner guided her. They had plenty of time (years) to perfect this technique.

I don't have an answer to the tomato scene and to be quite honest i am ashamed to say that i didn't notice the grocery conundrum. But... didn't she make the whole story up anyway? So perhaps the holes in the narrative arn't so bad as it is quite difficult to lie in that kind of detail without slipping up and we really should be critiquing the characters in the series for being a bit dim and getting sucked in without showing any form of critical thinking when she recounted this series of events.