Yes
Going back how far? We've been analyzing Trump's tweets for intentional peculiarities of spelling, grammar, capitalization, spacing, punctuation, etc. since the beginning and have found them very frequently. Far too many to enumerate in a single post or a single bread.
In fact anons analyze every tweet this way and it is a regular topic of discussion here.
(But you knew that … right?)
One purpose of Q drops appears to be to frighten specific deep state individuals into making mistakes, which make prosecution easier and entrap connected individuals. When the prosecutions are made public then you will eat your words.
Meanwhile, we are happy to be Q's cyber militia and perform our role of digging, meming and praying.