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")
The North American ferret is a black footed not silver footed ferret. In addition the ferret was listed as extinct in the wild in 1987 and with help of a breeding program 1991-2008 it was reintroduced so there is no way that a ferret was even in that house.
Kimmy tells Stephanie that she looks like "the little girl from Poltergeist (1982), who got sucked into the TV." Carol Anne, the little girl, was sucked into another dimension through her bedroom closet. A TV set was relevant in the early parts of the film because Carol Anne used it to contact spirits.
When Danny comes in for his promo practice, his cue card doesn't say anything about a dog. When he moves to the couch all of a sudden the cue card now mentions the dogs entrance.