 The letters OPE and POE from  _Dr. Strangelove or: How I Learned to Stop Worrying and Love the Bomb (1964)_ (qv)  can be seen on the wall of the RV park washroom. This is actually a  tribute within a tribute as in the film  _Raising Arizona (1987)_ (qv), the same initials OPE and POE are  displayed in a restroom as well.