The core of the joke isn't really specific to Judaism: you're led to think the mom's in prison when she's actually imprisoned by her task of scrubbing that tub. In fact, I doubt that the creators of the video had Pesach in mind at all; I suspect it was originally part of an advertisement for some bathroom cleaning product. But the joke easily lends itself to the Pesach season, when many a housewife becomes chained to Herculean cleaning efforts in the name of ridding the house of the slightest crumb of leavened grain products. The text appended to the video clip implies that a significant amount of this grueling travail is overzealousness with which one could dispense if more attention were paid to the fine details of the legal codes that demand the elimination of leaven. Does that explanation kill the joke sufficiently?