By Jasmine Allday Celebrity Big Brother fans were left shocked after spotting a budget-busting detail in the background of the latest episode. The show returned tonight for its second episode, which saw the housemates learn that Sharon Osbourne and Louis Walsh had been judging the housemates and deciding who would be vulnerable for the first public vote. 12 celebrities entered the house last night alongside Celebrity Lodger Sharon Osbourne, with a whole host of big names as well as some other celebrities who may be less well known to viewers. It led fans to comment that the budget had been all…