So I was checking out THX 1138 on iTunes and found two versions of the film, which may be old news but I thought the details were interesting:
THX 1138 Director's Cut (HD)- released 2004 - runtime 1hr 28min
THX 1138 (SD) - released 1971 - runtime 1hr 24min
Link to images:
I don't mind spending the $3 to rent the latter version to confirm whether or not it is the original version.