Corrected entry: The cost of one ball of dark matter at Mombil is shown to cost $9.99 per ball and the total price costs $632.14. If you were to divide $9.99 by $632.14, the result would come out as 63.2772772773, making the total price cost impossible. (00:04:15)
Corrected entry: When the professor explains why he is so angry about the dark matter shortage, he says "it all began 30 years ago" and you can see that Mom's children are babies. But when Nibbler explains how he ended up in the factory with the other Nibblonians, he says it all began 36 years ago and Mom's children are adults. (00:26:25 - 00:43:10)
Correction: The professor actually says "thirty odd years ago", which could mean more than 30 years. Given his senility, that's a surprisingly good estimate.
Correction: First off, the price is $9.999/ball (a minor correction but important for the gasoline joke Futurama makes). It's possible she got charged tax that wasn't included in the $9.999 price.
Bishop73