[link to original on tumblr]
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If that structure were followed in the second verse, it'd be "Thursday morning at [some number] o'clock" and go on to tell about the girl. Instead, it starts with "Father snores as his wife gets into her dressing gown." The girl isn't physically present anymore, which is reflected in both A) her absence in the verse and B) Thursday's being skipped over.
I listened to the whole album (and noticed some other things, about which some more posts are queued) to finish off my transcription of "She's Leaving Home," and - in doing so - I noticed something else I'd never noticed: the lines before each chorus all end with a homophone ("buy" or "by"), which - after the proper chorus - are recalled with "bye." So, the first chorus:
(She) We gave her most of our lives
(Is leaving) Sacrificed most of our lives
(Home) We gave her everything money could buy
She's leaving homeThe second:
After living alone
(Bye bye) For so many years
(She) We never thought of ourselves
(Is leaving) Never a thought for ourselves
(Home) We struggled hard all our lives to get by
She's leaving homeAnd the third:
After living alone
(Bye bye) For so many years
(She) What did we do that was wrong
(Is having) We didn't know it was wrong
(Fun) Fun is the one thing that money can't buy
Something insideI'm not sure if there's anything to this other than just a poetic effect, but it's a great effect.
That was always denied
(Bye bye) For so many years