I posted this in the video clip thread - but it's valid here too I think. The Seattle production is a REGIONAL production. That means they do NOT have the same budget (not nearly) as they would for a Broadway show. That means that sets, costumes, etc are scaled as such. I wouldn't be surprised that when it comes to broadway it looks different.
"A little nonsense now and then is relished by the wisest men" - Willy Wonka