In the episode "Charity", Reese mentions a man dropped off a Nintendo Entertainment System and Double Dragon 4, to which Stevie responds "DD4? The Sacred Stones?". There was no Double Dragon 4 on the Nintendo Entertainment System, additionally, it is Double Dragon 3 that had "The Sacred Stones" in the title.
When Hal is driving the kids to sneak the items back into the church, a portion of the trailer on which their car sits is visible outside the driver's window. The trailer frame is visible in 3 separate shots as the car is moving, then breaks down.