In the first scene, the girls and Kimmy are seen in the garage and later Joey's belongings are seen in the alcove. However, the garage was renovated into Joey's room two episodes prior to this one ("Joey's Place").
In episode #10 Joey leaves and while he is gone, the family creates Joey his own bedroom in the garage. In episode #12 however, scenes take place in the garage where it is no longer designed as Joey's new room, it is still a garage.
In "Joey's Place", Joey gets his own room in the basement and all his stuff is moved out of the "spacious" alcove. But all of Joey's things are in the alcove and he has to move out in order to tape the promo.