What works for me in preventing common error 1 is putting the first item right behind the keyword and moving the comma's to the beginning of the lines:

SELECT FilmName

, FilmReleaseDate

FROM

tblFilm

This applies to every section:

ORDER BY Director

, FilmReleasedate

It decreased my number of errors that are introduced on deleting lines. I find it also logical to add a column to any section including its own separating comma.