It means they will soon have to replace the production molds. Happens all the time... well, occasionally. As long as the master molds are kept safe it is not a bad sign for the future...
And if you get a mini that is suffering too badly from faulty molds (you know, lumps of metal where there should be none, and/or parts that didn't fill completely, or pieces of rubber embedded not in the flash, but in the miniature itself), just talk to the people at mongoose - I'm sure they will replace it with a acceptable one (at least that's SOP - if the product you buy is not up to standard, it's the sellers/producers job to give you a good one). As long as it's just flash though... a sharp hobby knife will take care of it.