Actually, it's 256 distinct numbers because "0" is a number, too.
A computer uses binary digits, 1 and 0. If you have 1 byte = 8 bits, your smallest binary number is 0000 0000, and your biggest number is 1111 1111 (=>2^8-1, or  255 in decimal systems).
So the index system in the editor uses a single byte to store indices.

300 in decimal becomes 1 0010 1100 in binary. It would have  9 bits instead of 8, but you can't just take single additional bits from your memory, because your memory is organized in bytes. You would need two bytes to handle a number as big as 300.
Then again with two bytes, you would have 65536(=2^16) different numbers. Altough you could force your program to reject numbers that are bigger than 300, there would be no logical reason to restrict it to 300

And 250 becomes 1111 1010. My computer doesn't think it's a "round" number  

Edit:LPChip beat me to it

-The Knytt could believe that computer chips were potato chips for robots. (Ok, this one is poor.)

Seriously, I was hoping there were at least some hard studying knytts, who can read our 'ancient' letters, but as it sounds, they all are completely unaware of it. Anyway, here are some ideas which assume that some knytt can understand our language, but make mistakes while reading it:

-An old Knytt who likes 'ancient artifacts' tries to reconstruct human history. He has pages of a history book.
He finds pictures of electrical batteries and believes they were long ago used in battle. To 'support' his theory, he misreads battery sometimes mistakingly as "battlery".
A AA battery or a AAA battery looks to this Knytt like a 'battering ram' he once saw on one of his book pages.
A button cell looks to him like a shiny shield. But he isn't sure whether he mixed them up with normal buttons, so he wants you to find some for him to research.

-also: Some Knytts mistake  1GB RAM for a big ram (uncastrated male sheep)
-bugs --> computer bugs

-bluetooth: A knytt lives on an underground island. He can't leave it because he can't swim.
But he heard , that bluetooth was once used for connections. He wants you to find a blue tooth so he can build a bridge and finally leave his island.

...Regarding Mina. People could think you stole it from Nintendo and removed a 'd'. (--> Midna)
Or has nobody played Zelda:Twilight Princess? 

No, seriously, I understand the urge to have a unique name.
I sometimes have the same problems with characters.
Then you make something up.
Then you have a wonderful, beautiful, unique name with some 'k's and 'y's in it.
Then, people come and ask how to pronounce it. 

I personally like 'Mi'. It just fits in there, in the grand ancient Knytt scheme. Gather 'round, let me explain:
After all, it will be the third 'major knytt character' after (ummm..,) the first knytt and juni.
In japanese, three is written as　三, which has the readings さん(-->san) and み(-->mi).

I have some more japanese/chinese  analogies at hand,
but this post would become quite large, so this shall suffice.

Glad ya like it. Sent you the FullHD version. It's my own picture.

I have no snake and didn't want to wait till my neighbors snake had deceased.
So I spent some time today modelling the skull. It's basically a 3d-render and not a real photograph.
Hope you don't mind. Would be cool if it somehow manages to get into the final game if the style fits.