My most common mistakes in typing a script:

[AK-47]

I mistake Workspace for World

I sometimes type wait instead of sleep

I double my parentheses sometimes because when I type "(", it automatically adds ")".

I use Vector3.new instead of Vec2D (and along with this, I triple my values)

[Anti]

Same, except i dont use Vector3.new (anymore)
I hate when the script puts automaticly double " and )...
But if it were removed, i would want it back