A majority of it is your/you're, there/they're/their, to/too, duplicate punctuation etc.
I think modern spell/grammar checking software is capable of fixing this, right?
you would honestly be surprised. Most code editors don't have decent spell checkers in them. and ones that do can't handle these script files. Day 4 being the largest by far, even Visual Studio, which has a spell checker, freezes when trying to spell check those files. I've tried using Grammerly, which won't work natively inside Atom or Visual Studio, but will work in notepad, but becomes unstable at anything over 1000 lines of code.
I have a feeling that its due to so many things inside the code being "misspelled" because its code, and not english.
I have been slowly taking chunks of script out, less then 1000 lines at a time, spell checking them, and then putting them back in, its taking some time, but should be getting better.
I could just slow down when I type and fix 90% of it ;)
Sounds like something that allows exceptions to be defined in regex form would be optimal. I'd also imagine you could export the actual dialogue/narrative text and leave references to put it back in after spellchecking. But I haven't really worked with renpy before so I'm probably just talking out of my ass. :D