Tim DeFill and Trevor Farleys were played by the same actor, Rieves Bowers.
Hank's "lucky coin" was actually lost during the production. This was a coincidental similarity with the actual plot line.
If you look closely, there are face sculptures on the trees. Willis talking about them is in reference to this, giving more proof that the things Willis says are actually true.
Comparing the description of Clive's "prime hunting ground" to where Hank and Trevor actually show up hints at the idea that the directions Clive gave could have actually been very real, but Hank and Trevor ended up going the wrong way.