Quote:
Originally Posted by Billiam
You would be surprised at how many creaks and rattles are a result of poor design and/or engineering. For the most part interior components only fit together one way. There is almost no adjustment with these pieces.
Your Yaris is creak-free because it was engineering well with parts that fit together as they were designed too. Not how it was assemebled. 
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^This. I work for an automotive supplier and we spend tens (hundreds?) of thousands of dollars on "creaks and rattles" issues before a part ever hits production. Assembly is rarely to blame: it's either poorly designed or was made from materials that are prone to squeak.