Duke says Dwight's in "Cleaves Mills" cleaning up a mess -- a reference to another town in Stephen King's Maine. Cleaves Mills is where Johnny Smith lives in The Dead Zone. Several of Haven's producers also produced the TV adaptation of The Dead Zone.
The coach's office seen here is actually an office located on Haven's sound stages. "Haven" is filmed in a converted hockey and curling arena in Nova Scotia. This scene was supposed to be shot outside on a tennis court, but had to be moved inside after a sudden downpour.