From: muddersmilk | #256
That's really a good rule for every season.
Nope, S7 Buffy / S4 Angel is actually the opposite. In fact I think it's like the Angel S4 finale has to come before the last 2 episodes.
Though it really doesn't affect too much, as far as enjoyment of either show's plots go. Rephrased for increased vagueness.
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"One toot on this whistle will take you to a far away land."
-Toad, SMB3