Seriously, you've stirred up a hornets nest here.
That's the impression I got upon reading the replies!

Just send them back to head office and ask for replacements or your money back.
As a matter of principle you're right, but on the other hand: as far as inner frames are concerned it's much less of a hassle for me to replace them directly. Misprints are another matter entirely, that's for sure.
StJohn, your cost-benefit analysis of having laxer QC was an extremely interesting read. The willingness to accept those
invisible costs you talk about does not, I think, bode well for Playmobil: new customers (as Tahra rightly noted) get stung by the lack of quality upon their first purchases, and even veterans can't help being disappointed by the decline in quality.
The problem is the quality of the inlay – but is it shape, or plastic type? Is it the machine (or mould), or is it the raw material fed into that machine that makes the difference? 
That's a most interesting question, and one I do not feel qualified to answer. There are some excellent fellows here on the forum who might provide some insight into the matter, though.
Don't remember getting several klickys brand new with the "Apollo Syndrome" though
One klicky out of three from 6501 and two out of six from 5393 had it. Unlucky bunch (unluckier than the norm at least), I guess.