Cameo: When John and Karl first meet Officer Frank, he motions to two seedy-looking characters. These are director Will Slocombe and co-producer David Mandel.
The abandoned golf course in the film is the Hillmoor Golf Course in Lake Geneva, Wisconsin. It had been closed to the public for two years prior to filming. It is now owned by the City of Lake Geneva, and has been deemed too costly to sell or develop.