то у дэнни глаза какой-то странной формы, то у сэм колготки зелёные, то ещё чего.

Какие-то в русской версии левые стоны и завывания добавлены зачем-то.

Да, я тоже замечала, что наш Дэнни гораздо больше звуков издает, чем в оригинале - например, в драке иногда)

А вообще, какой же бой без "кийя"?

Mystery meat is a disparaging term for meat products, typically ground or otherwise processed, such as burger patties, chicken nuggets, Spam, Salisbury steaks, sausages, or hot dogs, that have an unidentifiable source. Most often the term is used in reference to food served in institutional cafeterias, such as prison food or an American public school lunch.

The term is also sometimes applied to meat products where the species from which the meat has come from is known, but the cuts of meat used are unknown. This is often the case where the cuts of meat used include offal and mechanically separated meat, or when non-meat substitutes such as textured vegetable protein are used to stretch the meat, where explicitly stating the type of meat used might diminish the perceived palatability of the product to some consumers.

Term used in the joint for all meat products. It tasted like shit and no one knew just exactly what animal(s) it came from.

Meat that is not readily identifiable, especially as served in a student dining hall, fraternity house, etc

с какой целью существующие.

И одновременно создатели, возможно, добавляют второй смысл, "mystery meat" -- такое мясо, которое связано с тайной, мистикой, [призраками].

Могу накинуть ещё одну теорию, но тут уже может быть совсем надумано: у них почему-то оказались в школе целые залежи мяса, таинственные, и лично мне не понятно, с какой целью существующие.