Plot hole: Assuming the reclusive Clay Calloway kept all his doors and windows locked, there is no way Ash and Buster would have got inside his house.
Suggested correction: 1) Why would you assume he kept the doors and windows locked? Besides being inconvenient, he has an electrified fence to keep out trespassers. 2) Ash and Buster were brought into the house while they were unconscious by Calloway himself.
Plot hole: Johnny's dad jumps in his truck and gets to Johnny in moments. That same journey was shown to be an overnight bus journey for everyone else.