This is what the dictionary says:
al·lu·sion<span>əˈlo͞oZHən/</span>nounan expression designed to call something to mind without mentioning it explicitly; an indirect or passing reference."an allusion to Shakespeare"<span>synonyms:<span>reference to, mention of, suggestion of, hint to, intimation of, comment on, remark on"the town's name is an allusion to its founding family"</span></span>the practice of making allusions, especially as an artistic device.
Its something to do with referencing something
In all cells, there are 23 chromosomes. Yes, even in a sex cell.
Together, 2 people, with 23 chromosomes (including sex cells) have 46 altogether, which allows a new person come to this world :)
↑ ↑ ↑ Hope this helps! :D
They probably failed to acknowledge the important parts of the goal or just didnt plan carefully.