Whenever there is a tragedy, it invariably trickles backwards and becomes a standards note.
First one that comes to mind - was From Lilo and Stitch (quoting wikipedia) where:
"The original plan for the ending of Lilo & Stitch was completely changed due to the September 11, 2001 attacks.   The original ending featured Stitch stealing a 747 then joyriding among the office and hotel towers of Honolulu; the revised ending uses a spaceship racing through clouds and through a tight valley with Dr. Jumba (the gradually friendlier mad scientist) at the controls while Stitch steals a full tanker truck and rides it down the crater of a volcano. "
I'm not gonna blog about yesterday. It's a bummer. But, it did get me thinking... what other "this happened so change that" stories you guys got?