The first error concerns hitting the wrong key. Most often I hit the key next to the key I want to press. I have to go back to the position have to delete the character and retype the correct letter. I cannot speed up this kind of restoring.
The second typing error I often make is hitting keys in an incorrect order. An incorrectly spelled keyword in GFA-BASIC 32 marks the source code line in "error-state" after hitting [Enter]. That is the moment I realize I mistyped something. For instance:
Locla Bool fCommentLine
This kind of error is very easy to correct. Put the caret between the l and the a and then hit Ctrl-T. This swaps the two characters at either side of the caret.